[Kamailio-Users] Registration delays when using Kamailio proxy

2 Feb 2010

Hello,

I am using an x-lite softphone to register with my SIP domain,

(a) Without an outbound proxy - Registration is successful and takes 
about 3 seconds
(b) With an outbound proxy - Registration is successful but takes nearly 
15 seconds
I briefly describe below the sequence of SIP messages while using the 
outbound proxy

Register softphone -> proxy
Register proxy -> SIP server
Register softphone -> proxy
407 Proxy authentication reqd. SIP server -> proxy
Register softphone -> proxy
407 Proxy authentication reqd. proxy -> softphone
Register softphone -> proxy (With Digest response)
Register proxy -> SIP server (With Digest response)
200 OK Sip server -> proxy
Register softphone -> proxy (With Digest response)

I am attaching a log with wireshark captures that show SIP messages
exchanged between the SIP server,SIP proxy and the x-lite softphone. The 
log shows several messages being duplicated (REGISTER, 200 OK)

1) Why does the softphone continue to send REGISTER messages after
receiving a 200 OK response ? (almost 15 repetitions of REGISTER after
receiving 200 OK)

2) What is the reason for the delay in registration times with/without 
the proxy ?

Thanks and Regards,
Vikram.

No.     Time   Source      Destination      Protocol Info
 1 0.000000    ab.cde.fgh.ijx(xlite)   ab.cde.fgh.ijk(proxy)   SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 1 (611 bytes on wire, 611 bytes captured)
Ethernet II, Src: 1a:1b:1c:1d:1e:1f (1a:1b:1c:1d:1e:1f), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: 33374 (33374), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-c252300b156adb6c-1---d8754z-;rport
   Max-Forwards: 70
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 1 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0

 3 0.839564    ab.cde.fgh.ijk(proxy)   lm.nop.qrs.tu(server)    SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 3 (722 bytes on wire, 722 bytes captured)
Ethernet II, Src: Supermic_bd:b9:bc (00:30:48:bd:b9:bc), Dst: Unispher_40:b5:39
(00:90:1a:40:b5:39)
Internet Protocol, Src: ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy)), Dst:
lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bK31c8.d11a2c71.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;received=ab.cde.fgh.ijx(xlite);branch=z9hG4bK-d8754z-c252300b156adb6c-1---d8754z-;rport=33374
   Max-Forwards: 69
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 1 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0
   P-hint: outbound

No.     Time   Source      Destination      Protocol Info
 4 0.952097    lm.nop.qrs.tu(server)    ab.cde.fgh.ijk(proxy)   SIP Status: 407 Proxy
Authentication Required    (0 bindings)

Frame 4 (555 bytes on wire, 555 bytes captured)
Ethernet II, Src: Unispher_40:b5:39 (00:90:1a:40:b5:39), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Status-Line: SIP/2.0 407 Proxy Authentication Required
    Message Header
   CSeq: 1 REGISTER
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bK31c8.d11a2c71.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-c252300b156adb6c-1---d8754z-;rport=33374
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=030240100052
   Proxy-Authenticate: DIGEST realm="VoipSwitch",
nonce="126513605203001203402405205305"
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
 5 1.404504    ab.cde.fgh.ijk(proxy)   lm.nop.qrs.tu(server)    SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 5 (722 bytes on wire, 722 bytes captured)
Ethernet II, Src: Supermic_bd:b9:bc (00:30:48:bd:b9:bc), Dst: Unispher_40:b5:39
(00:90:1a:40:b5:39)
Internet Protocol, Src: ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy)), Dst:
lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bK31c8.d11a2c71.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;received=ab.cde.fgh.ijx(xlite);branch=z9hG4bK-d8754z-c252300b156adb6c-1---d8754z-;rport=33374
   Max-Forwards: 69
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 1 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0
   P-hint: outbound

No.     Time   Source      Destination      Protocol Info
 6 1.517292    lm.nop.qrs.tu(server)    ab.cde.fgh.ijk(proxy)   SIP Status: 407 Proxy
Authentication Required    (0 bindings)

Frame 6 (555 bytes on wire, 555 bytes captured)
Ethernet II, Src: Unispher_40:b5:39 (00:90:1a:40:b5:39), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Status-Line: SIP/2.0 407 Proxy Authentication Required
    Message Header
   CSeq: 1 REGISTER
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bK31c8.d11a2c71.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-c252300b156adb6c-1---d8754z-;rport=33374
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=030240100053
   Proxy-Authenticate: DIGEST realm="VoipSwitch",
nonce="126513605303001203402405305305"
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
 7 1.522829    ab.cde.fgh.ijx(xlite)   ab.cde.fgh.ijk(proxy)   SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 7 (611 bytes on wire, 611 bytes captured)
Ethernet II, Src: 1a:1b:1c:1d:1e:1f (1a:1b:1c:1d:1e:1f), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: 33374 (33374), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-c252300b156adb6c-1---d8754z-;rport
   Max-Forwards: 70
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 1 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
 8 2.522300    ab.cde.fgh.ijk(proxy)   ab.cde.fgh.ijx(xlite)   SIP Status: 407 Proxy
Authentication Required    (0 bindings)

Frame 8 (492 bytes on wire, 492 bytes captured)
Ethernet II, Src: Supermic_bd:b9:bc (00:30:48:bd:b9:bc), Dst: 1a:1b:1c:1d:1e:1f
(1a:1b:1c:1d:1e:1f)
Internet Protocol, Src: ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy)), Dst:
ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite))
User Datagram Protocol, Src Port: sip (5060), Dst Port: 33374 (33374)
Session Initiation Protocol
    Status-Line: SIP/2.0 407 Proxy Authentication Required
    Message Header
   CSeq: 1 REGISTER
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-c252300b156adb6c-1---d8754z-;rport=33374
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=030240100052
   Proxy-Authenticate: DIGEST realm="VoipSwitch",
nonce="126513605203001203402405205305"
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
 9 2.730896    ab.cde.fgh.ijx(xlite)   ab.cde.fgh.ijk(proxy)   SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 9 (801 bytes on wire, 801 bytes captured)
Ethernet II, Src: 1a:1b:1c:1d:1e:1f (1a:1b:1c:1d:1e:1f), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: 33374 (33374), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-4248775550708257-1---d8754z-;rport
   Max-Forwards: 70
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 2 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   Proxy-Authorization: Digest
username="1234",realm="VoipSwitch",nonce="126513605203001203402405205305",uri="sip:lm.nop.qrs.tu(server)",response="2c0d7d2f3b4cc218792ebef30e0eb2e6",algorithm=MD5
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     10 2.796109    ab.cde.fgh.ijk(proxy)   ab.cde.fgh.ijx(xlite)   SIP Status: 407 Proxy
Authentication Required    (0 bindings)

Frame 10 (492 bytes on wire, 492 bytes captured)
Ethernet II, Src: Supermic_bd:b9:bc (00:30:48:bd:b9:bc), Dst: 1a:1b:1c:1d:1e:1f
(1a:1b:1c:1d:1e:1f)
Internet Protocol, Src: ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy)), Dst:
ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite))
User Datagram Protocol, Src Port: sip (5060), Dst Port: 33374 (33374)
Session Initiation Protocol
    Status-Line: SIP/2.0 407 Proxy Authentication Required
    Message Header
   CSeq: 1 REGISTER
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-c252300b156adb6c-1---d8754z-;rport=33374
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=030240100052
   Proxy-Authenticate: DIGEST realm="VoipSwitch",
nonce="126513605203001203402405205305"
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     11 3.308767    ab.cde.fgh.ijx(xlite)   ab.cde.fgh.ijk(proxy)   SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 11 (801 bytes on wire, 801 bytes captured)
Ethernet II, Src: 1a:1b:1c:1d:1e:1f (1a:1b:1c:1d:1e:1f), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: 33374 (33374), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-4248775550708257-1---d8754z-;rport
   Max-Forwards: 70
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 2 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   Proxy-Authorization: Digest
username="1234",realm="VoipSwitch",nonce="126513605203001203402405205305",uri="sip:lm.nop.qrs.tu(server)",response="2c0d7d2f3b4cc218792ebef30e0eb2e6",algorithm=MD5
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     12 4.099907    ab.cde.fgh.ijk(proxy)   lm.nop.qrs.tu(server)    SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 12 (912 bytes on wire, 912 bytes captured)
Ethernet II, Src: Supermic_bd:b9:bc (00:30:48:bd:b9:bc), Dst: Unispher_40:b5:39
(00:90:1a:40:b5:39)
Internet Protocol, Src: ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy)), Dst:
lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bK01c8.2e6fe072.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;received=ab.cde.fgh.ijx(xlite);branch=z9hG4bK-d8754z-4248775550708257-1---d8754z-;rport=33374
   Max-Forwards: 69
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 2 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   Proxy-Authorization: Digest
username="1234",realm="VoipSwitch",nonce="126513605203001203402405205305",uri="sip:lm.nop.qrs.tu(server)",response="2c0d7d2f3b4cc218792ebef30e0eb2e6",algorithm=MD5
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0
   P-hint: outbound

No.     Time   Source      Destination      Protocol Info
     13 4.216914    lm.nop.qrs.tu(server)    ab.cde.fgh.ijk(proxy)   SIP Status: 407 Proxy
Authentication Required    (0 bindings)

Frame 13 (555 bytes on wire, 555 bytes captured)
Ethernet II, Src: Unispher_40:b5:39 (00:90:1a:40:b5:39), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Status-Line: SIP/2.0 407 Proxy Authentication Required
    Message Header
   CSeq: 2 REGISTER
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bK01c8.2e6fe072.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-4248775550708257-1---d8754z-;rport=33374
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=030240100055
   Proxy-Authenticate: DIGEST realm="VoipSwitch",
nonce="126513605503001203402405505305"
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     14 4.324392    ab.cde.fgh.ijx(xlite)   ab.cde.fgh.ijk(proxy)   SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 14 (801 bytes on wire, 801 bytes captured)
Ethernet II, Src: 1a:1b:1c:1d:1e:1f (1a:1b:1c:1d:1e:1f), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: 33374 (33374), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-4248775550708257-1---d8754z-;rport
   Max-Forwards: 70
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 2 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   Proxy-Authorization: Digest
username="1234",realm="VoipSwitch",nonce="126513605203001203402405205305",uri="sip:lm.nop.qrs.tu(server)",response="2c0d7d2f3b4cc218792ebef30e0eb2e6",algorithm=MD5
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     15 4.704708    ab.cde.fgh.ijk(proxy)   lm.nop.qrs.tu(server)    SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 15 (912 bytes on wire, 912 bytes captured)
Ethernet II, Src: Supermic_bd:b9:bc (00:30:48:bd:b9:bc), Dst: Unispher_40:b5:39
(00:90:1a:40:b5:39)
Internet Protocol, Src: ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy)), Dst:
lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bK01c8.2e6fe072.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;received=ab.cde.fgh.ijx(xlite);branch=z9hG4bK-d8754z-4248775550708257-1---d8754z-;rport=33374
   Max-Forwards: 69
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 2 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   Proxy-Authorization: Digest
username="1234",realm="VoipSwitch",nonce="126513605203001203402405205305",uri="sip:lm.nop.qrs.tu(server)",response="2c0d7d2f3b4cc218792ebef30e0eb2e6",algorithm=MD5
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0
   P-hint: outbound

No.     Time   Source      Destination      Protocol Info
     16 4.822244    lm.nop.qrs.tu(server)    ab.cde.fgh.ijk(proxy)   SIP Status: 407 Proxy
Authentication Required    (0 bindings)

Frame 16 (555 bytes on wire, 555 bytes captured)
Ethernet II, Src: Unispher_40:b5:39 (00:90:1a:40:b5:39), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Status-Line: SIP/2.0 407 Proxy Authentication Required
    Message Header
   CSeq: 2 REGISTER
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bK01c8.2e6fe072.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-4248775550708257-1---d8754z-;rport=33374
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=030240100056
   Proxy-Authenticate: DIGEST realm="VoipSwitch",
nonce="126513605603001203402405605305"
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     17 5.710292    ab.cde.fgh.ijk(proxy)   ab.cde.fgh.ijx(xlite)   SIP Status: 407 Proxy
Authentication Required    (0 bindings)

Frame 17 (492 bytes on wire, 492 bytes captured)
Ethernet II, Src: Supermic_bd:b9:bc (00:30:48:bd:b9:bc), Dst: 1a:1b:1c:1d:1e:1f
(1a:1b:1c:1d:1e:1f)
Internet Protocol, Src: ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy)), Dst:
ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite))
User Datagram Protocol, Src Port: sip (5060), Dst Port: 33374 (33374)
Session Initiation Protocol
    Status-Line: SIP/2.0 407 Proxy Authentication Required
    Message Header
   CSeq: 2 REGISTER
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-4248775550708257-1---d8754z-;rport=33374
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=030240100055
   Proxy-Authenticate: DIGEST realm="VoipSwitch",
nonce="126513605503001203402405505305"
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     18 5.724689    ab.cde.fgh.ijk(proxy)   ab.cde.fgh.ijx(xlite)   SIP Status: 407 Proxy
Authentication Required    (0 bindings)

Frame 18 (492 bytes on wire, 492 bytes captured)
Ethernet II, Src: Supermic_bd:b9:bc (00:30:48:bd:b9:bc), Dst: 1a:1b:1c:1d:1e:1f
(1a:1b:1c:1d:1e:1f)
Internet Protocol, Src: ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy)), Dst:
ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite))
User Datagram Protocol, Src Port: sip (5060), Dst Port: 33374 (33374)
Session Initiation Protocol
    Status-Line: SIP/2.0 407 Proxy Authentication Required
    Message Header
   CSeq: 2 REGISTER
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-4248775550708257-1---d8754z-;rport=33374
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=030240100055
   Proxy-Authenticate: DIGEST realm="VoipSwitch",
nonce="126513605503001203402405505305"
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     19 5.832474    ab.cde.fgh.ijx(xlite)   ab.cde.fgh.ijk(proxy)   SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 19 (801 bytes on wire, 801 bytes captured)
Ethernet II, Src: 1a:1b:1c:1d:1e:1f (1a:1b:1c:1d:1e:1f), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: 33374 (33374), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-316786162159173a-1---d8754z-;rport
   Max-Forwards: 70
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 3 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   Proxy-Authorization: Digest
username="1234",realm="VoipSwitch",nonce="126513605503001203402405505305",uri="sip:lm.nop.qrs.tu(server)",response="014a8ffc9e6cc551acc86b22f2c26c11",algorithm=MD5
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     21 7.455368    ab.cde.fgh.ijk(proxy)   lm.nop.qrs.tu(server)    SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 21 (912 bytes on wire, 912 bytes captured)
Ethernet II, Src: Supermic_bd:b9:bc (00:30:48:bd:b9:bc), Dst: Unispher_40:b5:39
(00:90:1a:40:b5:39)
Internet Protocol, Src: ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy)), Dst:
lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bK11c8.7f536395.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;received=ab.cde.fgh.ijx(xlite);branch=z9hG4bK-d8754z-316786162159173a-1---d8754z-;rport=33374
   Max-Forwards: 69
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 3 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   Proxy-Authorization: Digest
username="1234",realm="VoipSwitch",nonce="126513605503001203402405505305",uri="sip:lm.nop.qrs.tu(server)",response="014a8ffc9e6cc551acc86b22f2c26c11",algorithm=MD5
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0
   P-hint: outbound

No.     Time   Source      Destination      Protocol Info
     22 7.457267    ab.cde.fgh.ijx(xlite)   ab.cde.fgh.ijk(proxy)   SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 22 (801 bytes on wire, 801 bytes captured)
Ethernet II, Src: 1a:1b:1c:1d:1e:1f (1a:1b:1c:1d:1e:1f), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: 33374 (33374), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-316786162159173a-1---d8754z-;rport
   Max-Forwards: 70
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 3 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   Proxy-Authorization: Digest
username="1234",realm="VoipSwitch",nonce="126513605503001203402405505305",uri="sip:lm.nop.qrs.tu(server)",response="014a8ffc9e6cc551acc86b22f2c26c11",algorithm=MD5
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     23 7.574533    lm.nop.qrs.tu(server)    ab.cde.fgh.ijk(proxy)   SIP Status: 200 OK   
(1 bindings)

Frame 23 (539 bytes on wire, 539 bytes captured)
Ethernet II, Src: Unispher_40:b5:39 (00:90:1a:40:b5:39), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Status-Line: SIP/2.0 200 OK
    Message Header
   CSeq: 3 REGISTER
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bK11c8.7f536395.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-316786162159173a-1---d8754z-;rport=33374
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=030240100059
   Contact:
<sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>;expires=60
   Expires: 60
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     24 8.355247    ab.cde.fgh.ijk(proxy)   lm.nop.qrs.tu(server)    SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 24 (912 bytes on wire, 912 bytes captured)
Ethernet II, Src: Supermic_bd:b9:bc (00:30:48:bd:b9:bc), Dst: Unispher_40:b5:39
(00:90:1a:40:b5:39)
Internet Protocol, Src: ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy)), Dst:
lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bK11c8.7f536395.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;received=ab.cde.fgh.ijx(xlite);branch=z9hG4bK-d8754z-316786162159173a-1---d8754z-;rport=33374
   Max-Forwards: 69
   Contact: <sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 3 REGISTER
   Expires: 3600
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   Proxy-Authorization: Digest
username="1234",realm="VoipSwitch",nonce="126513605503001203402405505305",uri="sip:lm.nop.qrs.tu(server)",response="014a8ffc9e6cc551acc86b22f2c26c11",algorithm=MD5
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0
   P-hint: outbound

No.     Time   Source      Destination      Protocol Info
     25 8.472891    lm.nop.qrs.tu(server)    ab.cde.fgh.ijk(proxy)   SIP Status: 200 OK   
(1 bindings)

Frame 25 (539 bytes on wire, 539 bytes captured)
Ethernet II, Src: Unispher_40:b5:39 (00:90:1a:40:b5:39), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Status-Line: SIP/2.0 200 OK
    Message Header
   CSeq: 3 REGISTER
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bK11c8.7f536395.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-316786162159173a-1---d8754z-;rport=33374
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=030241100000
   Contact:
<sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>;expires=60
   Expires: 60
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     26 9.310268    ab.cde.fgh.ijk(proxy)   ab.cde.fgh.ijx(xlite)   SIP Status: 200 OK   
(1 bindings)

Frame 26 (476 bytes on wire, 476 bytes captured)
Ethernet II, Src: Supermic_bd:b9:bc (00:30:48:bd:b9:bc), Dst: 1a:1b:1c:1d:1e:1f
(1a:1b:1c:1d:1e:1f)
Internet Protocol, Src: ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy)), Dst:
ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite))
User Datagram Protocol, Src Port: sip (5060), Dst Port: 33374 (33374)
Session Initiation Protocol
    Status-Line: SIP/2.0 200 OK
    Message Header
   CSeq: 3 REGISTER
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-316786162159173a-1---d8754z-;rport=33374
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=030240100059
   Contact:
<sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>;expires=60
   Expires: 60
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     29 10.939788   ab.cde.fgh.ijx(xlite)   ab.cde.fgh.ijk(proxy)   SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 29 (796 bytes on wire, 796 bytes captured)
Ethernet II, Src: 1a:1b:1c:1d:1e:1f (1a:1b:1c:1d:1e:1f), Dst: Supermic_bd:b9:bc
(00:30:48:bd:b9:bc)
Internet Protocol, Src: ab.cde.fgh.ijx(xlite) (ab.cde.fgh.ijx(xlite)), Dst:
ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy))
User Datagram Protocol, Src Port: 33374 (33374), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;branch=z9hG4bK-d8754z-075267174a75f03a-1---d8754z-;rport
   Max-Forwards: 70
   Contact:
<sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>;expires=0
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 4 REGISTER
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   Proxy-Authorization: Digest
username="1234",realm="VoipSwitch",nonce="126513605503001203402405505305",uri="sip:lm.nop.qrs.tu(server)",response="014a8ffc9e6cc551acc86b22f2c26c11",algorithm=MD5
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0

No.     Time   Source      Destination      Protocol Info
     30 11.097051   ab.cde.fgh.ijk(proxy)   lm.nop.qrs.tu(server)    SIP Request: REGISTER
sip:lm.nop.qrs.tu(server)

Frame 30 (907 bytes on wire, 907 bytes captured)
Ethernet II, Src: Supermic_bd:b9:bc (00:30:48:bd:b9:bc), Dst: Unispher_40:b5:39
(00:90:1a:40:b5:39)
Internet Protocol, Src: ab.cde.fgh.ijk(proxy) (ab.cde.fgh.ijk(proxy)), Dst:
lm.nop.qrs.tu(server) (lm.nop.qrs.tu(server))
User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
Session Initiation Protocol
    Request-Line: REGISTER sip:lm.nop.qrs.tu(server) SIP/2.0
    Message Header
   Via: SIP/2.0/UDP ab.cde.fgh.ijk(proxy);branch=z9hG4bKe0c8.73270ff2.0
   Via: SIP/2.0/UDP
ab.cde.fgh.ijx(xlite):50648;received=ab.cde.fgh.ijx(xlite);branch=z9hG4bK-d8754z-075267174a75f03a-1---d8754z-;rport=33374
   Max-Forwards: 69
   Contact:
<sip:1234@ab.cde.fgh.ijx(xlite):50648;rinstance=0f34c912798e872d>;expires=0
   To: "1234"<sip:1234@lm.nop.qrs.tu(server)>
   From: "1234"<sip:1234@lm.nop.qrs.tu(server)>;tag=cb57d146
   Call-ID: Zjg5MTdhZjMyYTZlMzlmZTA2NjY4MDBhMjNhYjkyMDU.
   CSeq: 4 REGISTER
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   Proxy-Authorization: Digest
username="1234",realm="VoipSwitch",nonce="126513605503001203402405505305",uri="sip:lm.nop.qrs.tu(server)",response="014a8ffc9e6cc551acc86b22f2c26c11",algorithm=MD5
   User-Agent: X-Lite release 1104o stamp 56125
   Content-Length: 0
   P-hint: outbound

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[Kamailio-Users] Registration delays when using Kamailio proxy