Hi, I have updated Kamailio to 5.4 still there is an issue with Cseq of cancel in case of cancel it is not increasing cSeq

here are details

1. proxy a sends invite with CSeq: 102 INVITE and proxy b route it to asterisk with CSeq: 102 INVITE

2. asterisk sends 401 Unauthorized with CSeq: 102 INVITE and proxy b sends ACK with CSeq: 102 ACK

3. proxy b sends invite with CSeq: 103 INVITE and asterisk sends 100 Trying and 180 Ringing with CSeq: 103 INVITE

4. proxy b relay to proxy a 180 Ringing with CSeq: 102 INVITE

5. proxy a send CANCEL with CSeq: 102 CANCEL and proxy b sends CANCEL with CSeq: 102 CANCEL to asterisk

6. Now asterisk is sending 481 Call leg/transaction does not exist

uname -a: Linux example.com 4.15.0-124-generic #127-Ubuntu SMP Fri Nov 6 10:54:43 UTC 2020 x86_64 GNU/Linux

kamailio -v: version: kamailio 5.4.3 (x86_64/linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled with gcc 6.3.0

sip logs:

2020/12/17 11:42:32.289934 proxy-a.com:5060 -> 10.0.14.118:5060
INVITE sip:123456@proxy-a.com SIP/2.0
Record-Route: <sip:proxy-a.com;lr>
Via: SIP/2.0/UDP proxy-a.com:5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK3756a567;rport=5060
Max-Forwards: 70
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>
Contact: <sip:54321@did.com:5060>
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
User-Agent: VB-Proxy
CSeq: 102 INVITE
User-Agent: did
Date: Thu, 17 Dec 2020 11:42:32 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Remote-Party-ID: "54321" <sip:54321@did.com>;party=calling;privacy=off;screen=no
Content-Type: application/sdp
Content-Length: 889

2020/12/17 11:42:32.290569 10.0.14.118:5060 -> proxy-a.com:5060
SIP/2.0 100 trying -- your call is important to us
Via: SIP/2.0/UDP proxy-a.com:5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1;rport=5060
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK3756a567;rport=5060
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 102 INVITE
Server: kamailio (5.4.3 (x86_64/linux))
Content-Length: 0

2020/12/17 11:42:32.291036 10.0.14.118:5060 -> 10.0.14.118:6000
INVITE sip:123456@proxy-a.com SIP/2.0
Record-Route: <sip:sip.comms.kuflink.com;lr;did=baf.7bf1>
Record-Route: <sip:proxy-a.com;lr>
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.0
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK3756a567;rport=5060
Max-Forwards: 70
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>
Contact: <sip:54321@did.com:5060>
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
User-Agent: VB-Proxy
CSeq: 102 INVITE
User-Agent: did
Date: Thu, 17 Dec 2020 11:42:32 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Remote-Party-ID: "54321" <sip:54321@did.com>;party=calling;privacy=off;screen=no
Content-Type: application/sdp
Content-Length: 889

2020/12/17 11:42:32.308279 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.0;received=10.0.14.118;rport=5060
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK3756a567;rport=5060
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>;tag=as152bd976
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 102 INVITE
Server: did
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="sip1.comms.kuflink.com", nonce="3673a540"
Content-Length: 0

2020/12/17 11:42:32.308770 10.0.14.118:5060 -> 10.0.14.118:6000
ACK sip:123456@proxy-a.com SIP/2.0
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.0
Max-Forwards: 70
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>;tag=as152bd976
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 102 ACK
Content-Length: 0

2020/12/17 11:42:32.309610 10.0.14.118:5060 -> 10.0.14.118:6000
INVITE sip:123456@proxy-a.com SIP/2.0
Record-Route: <sip:sip.comms.kuflink.com;lr;did=baf.7bf1>
Record-Route: <sip:proxy-a.com;lr>
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.1.cs102
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK3756a567;rport=5060
Max-Forwards: 70
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>
Contact: <sip:54321@did.com:5060>
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
User-Agent: VB-Proxy
CSeq: 103 INVITE
User-Agent: did
Date: Thu, 17 Dec 2020 11:42:32 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Remote-Party-ID: "54321" <sip:54321@did.com>;party=calling;privacy=off;screen=no
Content-Type: application/sdp
Content-Length: 889
Authorization: Digest username="did095499", realm="sip1.comms.kuflink.com", nonce="3673a540", uri="sip:123456@proxy-a.com", response="24d8949f18f4f2650913ce3feaa78380", algorithm=MD5

2020/12/17 11:42:32.333610 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 100 Trying
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.1.cs102;received=10.0.14.118;rport=5060
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK3756a567;rport=5060
Record-Route: <sip:sip.comms.kuflink.com;lr;did=baf.7bf1>
Record-Route: <sip:proxy-a.com;lr>
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 103 INVITE
Server: did
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000>
Content-Length: 0

2020/12/17 11:42:34.276380 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.1.cs102;received=10.0.14.118;rport=5060
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK3756a567;rport=5060
Record-Route: <sip:sip.comms.kuflink.com;lr;did=baf.7bf1>
Record-Route: <sip:proxy-a.com;lr>
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>;tag=as12b14194
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 103 INVITE
Server: did
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000>
Content-Length: 0

2020/12/17 11:42:34.277337 10.0.14.118:5060 -> proxy-a.com:5060
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK3756a567;rport=5060
Record-Route: <sip:sip.comms.kuflink.com;lr;did=baf.7bf1>
Record-Route: <sip:proxy-a.com;lr>
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>;tag=as12b14194
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 102 INVITE
Server: did
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000;alias=10.0.14.118~6000~1>
Content-Length: 0

2020/12/17 11:42:38.113181 proxy-a.com:5060 -> 10.0.14.118:5060
CANCEL sip:123456@proxy-a.com SIP/2.0
Via: SIP/2.0/UDP proxy-a.com:5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1
Max-Forwards: 70
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 102 CANCEL
Content-Length: 0

2020/12/17 11:42:38.113918 10.0.14.118:5060 -> 10.0.14.118:6000
CANCEL sip:123456@proxy-a.com SIP/2.0
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.1
Max-Forwards: 70
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 102 CANCEL
Content-Length: 0
P-K-CSeq-Auth: 103

2020/12/17 11:42:38.114114 10.0.14.118:5060 -> proxy-a.com:5060
SIP/2.0 200 canceling
Via: SIP/2.0/UDP proxy-a.com:5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1;rport=5060
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>;tag=a74459175e9494c7e23ffeb306461015-0f770312
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 102 CANCEL
Server: kamailio (5.4.3 (x86_64/linux))
Content-Length: 0

2020/12/17 11:42:38.116456 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 481 Call leg/transaction does not exist
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.1;received=10.0.14.118;rport=5060
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>;tag=as24deed39
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 102 CANCEL
Server: did
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Content-Length: 0

2020/12/17 11:42:54.554350 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.1.cs102;received=10.0.14.118;rport=5060
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK3756a567;rport=5060
Record-Route: <sip:sip.comms.kuflink.com;lr;did=baf.7bf1>
Record-Route: <sip:proxy-a.com;lr>
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>;tag=as12b14194
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 103 INVITE
Server: did
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000>
Content-Type: application/sdp
Require: timer
Content-Length: 292

2020/12/17 11:42:54.554978 10.0.14.118:5060 -> 10.0.14.118:6000
CANCEL sip:123456@proxy-a.com SIP/2.0
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.1
Max-Forwards: 70
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 102 CANCEL
Content-Length: 0
P-K-CSeq-Auth: 103

2020/12/17 11:42:54.557082 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 481 Call leg/transaction does not exist
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.1;received=10.0.14.118;rport=5060
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>;tag=as5eee0295
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 102 CANCEL
Server: did
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Content-Length: 0

2020/12/17 11:42:59.617825 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 603 Declined
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.1.cs102;received=10.0.14.118;rport=5060
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK3756a567;rport=5060
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>;tag=as12b14194
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 103 INVITE
Server: did
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Content-Length: 0

2020/12/17 11:42:59.618423 10.0.14.118:5060 -> 10.0.14.118:6000
ACK sip:123456@proxy-a.com SIP/2.0
Via: SIP/2.0/UDP sip.comms.kuflink.com:5060;branch=z9hG4bKb7e1.bbcb7aefd10825105e2fce86fd82efe6.1.cs102
Max-Forwards: 70
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>;tag=as12b14194
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 103 ACK
Content-Length: 0

2020/12/17 11:42:59.618944 10.0.14.118:5060 -> proxy-a.com:5060
SIP/2.0 603 Declined
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK3756a567;rport=5060
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>;tag=as12b14194
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 102 INVITE
Server: did
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Content-Length: 0

2020/12/17 11:42:59.620074 proxy-a.com:5060 -> 10.0.14.118:5060
ACK sip:123456@proxy-a.com SIP/2.0
Via: SIP/2.0/UDP proxy-a.com:5060;branch=z9hG4bKb7e1.f58c5fbd664fa63cd69162afcb07f88a.1
Max-Forwards: 70
From: "54321" <sip:54321@did.com>;tag=as02b3f892
To: <sip:123456@proxy-a.com>;tag=as12b14194
Call-ID: 6a981008384dd72c23ee9e59690eb5eb@did.com
CSeq: 102 ACK
Content-Length: 0

On Thu, Dec 17, 2020 at 4:52 PM George Diamantopoulos <georgediam@gmail.com> wrote:

Not sure if this is related, but I've also run into issues with track_cseq_updates:

https://www.mail-archive.com/sr-users@lists.kamailio.org/msg12362.html

More specifically, kamailio won't process the 100 Trying to an Cseq-bumped INVITE it generated

itself with uac_auth() when track_cseq_updates is on.

This implementation appears to be a little too fragile for the time being....

BR,

George

On Thu, 17 Dec 2020 at 12:29, Terry Tailor <terry@fullduplex.co.uk> wrote:

Hi, Here is setup details

Kamailio Proxy a <-----> Kamailio Proxy b <-----> Asterisk

Kamailio proxy b auth based on IP Kamailio Proxy a

1. Kamailio proxy sends an Invite request to Kamailio proxy b with CSeq: 102 INVITE

2. Kamailio proxy b check again IP auth and sends invite request to asterisk with CSeq: 102 INVITE

4 asterisk response with 401 Unauthorized with CSeq: 102

5. Kamailio proxy b sends ACK request with CSeq: 102 ACK

6. Kamailio proxy b sends INVITE request with CSeq: 103 INVITE

7. Asterisk sends 100 trying and 180 ringing with CSeq: 103 INVITE

8. Kamailio proxy b relay 180 ringing with CSeq: 102 INVITE

9. Asterisk send 200 Ok with CSeq: 103 INVITE and proxy b relay it to proxy a with CSeq: 102 INVITE

10. Now Proxy a send an ACK with CSeq: 102 ACK and proxy b relay ACK to asterisk with CSeq: 102 ACK

Now asterisk is retransmitting 200 ok with CSeq: 103 INVITE and proxy a is sending ACK with Cseq: 102 ACK

Same happing in case of 487 Request Terminated

Here is my config

modparam("dialog", "default_timeout", 10800) # 3h
modparam("dialog", "dlg_match_mode", 1)
modparam("dialog", "db_mode", 0)
modparam("dialog", "send_bye", 1)
modparam("dialog", "track_cseq_updates", 1)
modparam("uac","auth_username_avp","$avp(auser)")
modparam("uac","auth_password_avp","$avp(apass)")
modparam("uac","auth_realm_avp","$avp(arealm)")

modparam("tm", "failure_reply_mode", 3)
# default retransmission timeout: 3 sec
modparam("tm", "fr_timer", 2000)
modparam("tm", "retr_timer1", 250)
modparam("tm", "retr_timer2", 500)
# default invite retransmission timeout after 1xx: 60 sec
modparam("tm", "fr_inv_timer", 60000)
modparam("tm", "reparse_on_dns_failover", 0)

if (is_method("INVITE") && !has_totag()) {
dlg_setflag(FLD_RTPPROXY);
dlg_manage();
}
route(RELAY);

route[RELAY] {

# At this point all checks are passed
t_on_branch("MANAGE_BRANCH");
t_on_reply("MANAGE_REPLY");
t_on_failure("MANAGE_FAILURE");
if(is_method("INVITE") && isflagset(FLT_FROMDID)) {
#$fd = "sip.comms.kuflink.com";
t_on_failure("RELAY_AUTH");
}

if (!t_relay()) {
send_reply("500", "Cannot relay to $du/$ru");
}
exit;
}

failure_route[RELAY_AUTH] {
t_on_branch("MANAGE_BRANCH");
t_on_reply("MANAGE_REPLY");
if (t_is_canceled()) {
exit;
}
if(t_check_status("401|407")) {
#$fd = "sip.comms.kuflink.com";
$avp(auser) = "DID_UA_USERNAME";
$avp(apass) = "DID_UA_PASSWORD";
if (uac_auth()) {
t_relay();
}
exit;
}
}

route[WITHINDLG] {
if (!has_totag()) {
return;
}

if (is_method("BYE")) {
rtpengine_delete();
}

# sequential request withing a dialog should
# take the path determined by record-routing
if (loose_route()) {
route(DLGURI);
if (is_method("ACK")) {
# ACK is forwarded statelessly
route(NATMANAGE);
} else if (is_method("NOTIFY")) {
# Add Record-Route for in-dialog NOTIFY as per RFC 6665.
record_route();
}
route(RELAY);
exit;
}

if (is_method("SUBSCRIBE") && uri == myself) {
# in-dialog subscribe requests
route(PRESENCE);
exit;
}
if (is_method("ACK") ) {
if (t_check_trans()) {
# no loose-route, but stateful ACK;
# must be an ACK after a 487
# or e.g. 404 from upstream server
route(RELAY);
exit;
} else {
# ACK without matching transaction ... ignore and discard
exit;
}
}
send_reply("404","Not here");
exit;
}

kamailio -v

version: kamailio 5.3.7 (x86_64/linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled with gcc 6.3.0

uname -a

Linux example.com 4.15.0-124-generic #127-Ubuntu SMP Fri Nov 6 10:54:43 UTC 2020 x86_64 GNU/Linux

SIP logs

2020/12/17 10:08:18.483907 proxy-a.com:5060 -> 10.0.14.118:5060
INVITE sip:123456@proxy-a.com SIP/2.0
Record-Route: <sip:proxy-a.com;lr>
Via: SIP/2.0/UDP proxy-a.com:5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
Max-Forwards: 70
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>
Contact: <sip:7654321@did.com:5060>
Call-ID: 67675c7e636d6e773860255316e54779@did.com
User-Agent: ProxyA
CSeq: 102 INVITE
User-Agent: proxy
Date: Thu, 17 Dec 2020 10:08:18 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Remote-Party-ID: "7654321" <sip:7654321@did.com>;party=calling;privacy=off;screen=no
Content-Type: application/sdp
Content-Length: 885

2020/12/17 10:08:18.485063 10.0.14.118:5060 -> proxy-a.com:5060
SIP/2.0 100 trying -- your call is important to us
Via: SIP/2.0/UDP proxy-a.com:5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1;rport=5060
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 102 INVITE
Server: kamailio (5.3.7 (x86_64/linux))
Content-Length: 0

2020/12/17 10:08:18.485576 10.0.14.118:5060 -> 10.0.14.118:6000
INVITE sip:123456@proxy-a.com SIP/2.0
Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
Record-Route: <sip:proxy-a.com;lr>
Via: SIP/2.0/UDP proxy-b.com:5060;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.0
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
Max-Forwards: 70
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>
Contact: <sip:7654321@did.com:5060>
Call-ID: 67675c7e636d6e773860255316e54779@did.com
User-Agent: ProxyA
CSeq: 102 INVITE
User-Agent: proxy
Date: Thu, 17 Dec 2020 10:08:18 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Remote-Party-ID: "7654321" <sip:7654321@did.com>;party=calling;privacy=off;screen=no
Content-Type: application/sdp
Content-Length: 885

2020/12/17 10:08:18.622867 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP proxy-b.com:5060;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.0;received=10.0.14.118;rport=5060
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as4107645c
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 102 INVITE
Server: proxy
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="sip1.comms.kuflink.com", nonce="11139d33"
Content-Length: 0

2020/12/17 10:08:18.624034 10.0.14.118:5060 -> 10.0.14.118:6000
ACK sip:123456@proxy-a.com SIP/2.0
Via: SIP/2.0/UDP proxy-b.com:5060;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.0
Max-Forwards: 70
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as4107645c
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 102 ACK
Content-Length: 0

2020/12/17 10:08:18.625557 10.0.14.118:5060 -> 10.0.14.118:6000
INVITE sip:123456@proxy-a.com SIP/2.0
Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
Record-Route: <sip:proxy-a.com;lr>
Via: SIP/2.0/UDP proxy-b.com:5060;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.1.cs102
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
Max-Forwards: 70
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>
Contact: <sip:7654321@did.com:5060>
Call-ID: 67675c7e636d6e773860255316e54779@did.com
User-Agent: ProxyA
CSeq: 103 INVITE
User-Agent: proxy
Date: Thu, 17 Dec 2020 10:08:18 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Remote-Party-ID: "7654321" <sip:7654321@did.com>;party=calling;privacy=off;screen=no
Content-Type: application/sdp
Content-Length: 885
Authorization: Digest username="xxxxx", realm="xxxx", nonce="11139d33", uri="sip:123456@proxy-a.com", response="qwewqeqwe", algorithm=MD5

2020/12/17 10:08:18.779483 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 100 Trying
Via: SIP/2.0/UDP proxy-b.com:5060;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.1.cs102;received=10.0.14.118;rport=5060
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
Record-Route: <sip:proxy-a.com;lr>
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 103 INVITE
Server: proxy
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000>
Content-Length: 0

2020/12/17 10:08:20.937756 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP proxy-b.com:5060;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.1.cs102;received=10.0.14.118;rport=5060
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
Record-Route: <sip:proxy-a.com;lr>
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as147bfa3e
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 103 INVITE
Server: proxy
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000>
Content-Length: 0

2020/12/17 10:08:20.938593 10.0.14.118:5060 -> proxy-a.com:5060
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
Record-Route: <sip:proxy-a.com;lr>
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as147bfa3e
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 102 INVITE
Server: proxy
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000;alias=10.0.14.118~6000~1>
Content-Length: 0

2020/12/17 10:08:22.075814 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP proxy-b.com:5060;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.1.cs102;received=10.0.14.118;rport=5060
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
Record-Route: <sip:proxy-a.com;lr>
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as147bfa3e
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 103 INVITE
Server: proxy
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000>
Content-Type: application/sdp
Require: timer
Content-Length: 296

2020/12/17 10:08:22.077049 10.0.14.118:5060 -> proxy-a.com:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
Record-Route: <sip:proxy-a.com;lr>
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as147bfa3e
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 102 INVITE
Server: proxy
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000;alias=10.0.14.118~6000~1>
Content-Type: application/sdp
Require: timer
Content-Length: 316

2020/12/17 10:08:22.103365 proxy-a.com:5060 -> 10.0.14.118:5060
ACK sip:123456@10.0.14.118:6000;alias=10.0.14.118~6000~1;alias=109.72.216.251~5060~1 SIP/2.0
Via: SIP/2.0/UDP proxy-a.com:5060;branch=z9hG4bKbe6d.0fc1940efc770391762d7d67094c24f8.0
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK2a5fae72;rport=5060
Route: <sip:proxy-b.com;lr;did=d18.7a9>
Max-Forwards: 70
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as147bfa3e
Contact: <sip:7654321@did.com:5060>
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 102 ACK
User-Agent: proxy
Content-Length: 0

2020/12/17 10:08:22.103877 10.0.14.118:5060 -> 10.0.14.118:6000
ACK sip:123456@10.0.14.118:6000;alias=109.72.216.251~5060~1 SIP/2.0
Via: SIP/2.0/UDP proxy-b.com:5060;branch=z9hG4bKbe6d.79f351d031912aae585207d2f26d5650.0
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.0fc1940efc770391762d7d67094c24f8.0
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK2a5fae72;rport=5060
Max-Forwards: 70
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as147bfa3e
Contact: <sip:7654321@did.com:5060>
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 102 ACK
User-Agent: proxy
Content-Length: 0
P-K-CSeq-Refresh: 103

2020/12/17 10:08:22.575533 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP proxy-b.com:5060;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.1.cs102;received=10.0.14.118;rport=5060
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
Record-Route: <sip:proxy-a.com;lr>
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as147bfa3e
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 103 INVITE
Server: proxy
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000>
Content-Type: application/sdp
Require: timer
Content-Length: 296

2020/12/17 10:08:22.576777 10.0.14.118:5060 -> proxy-a.com:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
Record-Route: <sip:proxy-a.com;lr>
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as147bfa3e
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 102 INVITE
Server: proxy
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000;alias=10.0.14.118~6000~1>
Content-Type: application/sdp
Require: timer
Content-Length: 316

2020/12/17 10:08:22.581649 proxy-a.com:5060 -> 10.0.14.118:5060
ACK sip:123456@10.0.14.118:6000;alias=10.0.14.118~6000~1;alias=109.72.216.251~5060~1 SIP/2.0
Via: SIP/2.0/UDP proxy-a.com:5060;branch=z9hG4bKbe6d.b9c7eeccd4cd7b44f05b173308dbaf0a.0
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK219933f6;rport=5060
Route: <sip:proxy-b.com;lr;did=d18.7a9>
Max-Forwards: 70
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as147bfa3e
Contact: <sip:7654321@did.com:5060>
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 102 ACK
User-Agent: proxy
Content-Length: 0

2020/12/17 10:08:22.582313 10.0.14.118:5060 -> 10.0.14.118:6000
ACK sip:123456@10.0.14.118:6000;alias=109.72.216.251~5060~1 SIP/2.0
Via: SIP/2.0/UDP proxy-b.com:5060;branch=z9hG4bKbe6d.33626b5695ad4648ba393bc62bed6a8c.0
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.b9c7eeccd4cd7b44f05b173308dbaf0a.0
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK219933f6;rport=5060
Max-Forwards: 70
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as147bfa3e
Contact: <sip:7654321@did.com:5060>
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 102 ACK
User-Agent: proxy
Content-Length: 0
P-K-CSeq-Refresh: 103

2020/12/17 10:08:23.575828 10.0.14.118:6000 -> 10.0.14.118:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP proxy-b.com:5060;branch=z9hG4bKbe6d.619fd995c3fc8764ce5cd9c7be7efeef.1.cs102;received=10.0.14.118;rport=5060
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
Record-Route: <sip:proxy-a.com;lr>
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as147bfa3e
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 103 INVITE
Server: proxy
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000>
Content-Type: application/sdp
Require: timer
Content-Length: 296

2020/12/17 10:08:23.577863 10.0.14.118:5060 -> proxy-a.com:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP proxy-a.com:5060;rport=5060;branch=z9hG4bKbe6d.10c4c5f001c66b8976214d4aef9f635c.1
Via: SIP/2.0/UDP did.com:5060;received=did.com;branch=z9hG4bK45f94ed9;rport=5060
Record-Route: <sip:proxy-b.com;lr;did=d18.7a9>
Record-Route: <sip:proxy-a.com;lr>
From: "7654321" <sip:7654321@did.com>;tag=as55c522e1
To: <sip:123456@proxy-a.com>;tag=as147bfa3e
Call-ID: 67675c7e636d6e773860255316e54779@did.com
CSeq: 102 INVITE
Server: proxy
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:123456@10.0.14.118:6000;alias=10.0.14.118~6000~1>
Content-Type: application/sdp
Require: timer
Content-Length: 316

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_______________________________________________
Kamailio (SER) - Users Mailing List
sr-users@lists.kamailio.org
https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users