Hi
Pls. help us in resolving the problem that the SIP proxy
server changes the Source and Destination port while replying for message. Pls.
find the below message for the Reference In below message A cisco ata device
(which is behind NAT with IP 192.168.10.52) is trying to register it self with
SIP proxy server IP 172.16.101.10 with SRC port 5060 and DST port 5060, but
when SIP proxy server replies back to the message the port number gets changed
i.e SRC port 53492 and DST port
5060. Is there any way by which we can fix this port num.
No.
Time
Source
Destination
Protocol Info
532 152.672945 172.16.101.251
172.16.101.10
SIP Request: REGISTER sip:172.16.101.10
Frame 532 (469 bytes on wire, 469 bytes captured)
Arrival Time: Nov 3, 2005
11:32:02.280623000
Time delta from previous packet:
0.007492000 seconds
Time since reference or first frame:
152.672945000 seconds
Frame Number: 532
Packet Length: 469 bytes
Capture Length: 469 bytes
Protocols in frame: eth:ip:udp:sip
Ethernet II, Src: Cisco_b5:15:f0 (00:04:c1:b5:15:f0), Dst:
Dell_17:ea:82 (00:14:22:17:ea:82)
Destination: Dell_17:ea:82 (00:14:22:17:ea:82)
Source: Cisco_b5:15:f0
(00:04:c1:b5:15:f0)
Type: IP (0x0800)
Internet Protocol, Src: 172.16.101.251 (172.16.101.251),
Dst: 172.16.101.10 (172.16.101.10)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x68 (DSCP
0x1a: Assured Forwarding 31; ECN: 0x00)
0110 10.. =
Differentiated Services Codepoint: Assured Forwarding 31 (0x1a)
.... ..0. =
ECN-Capable Transport (ECT): 0
.... ...0 =
ECN-CE: 0
Total Length: 455
Identification: 0x01f8 (504)
Flags: 0x00
0... = Reserved
bit: Not set
.0.. = Don't
fragment: Not set
..0. = More
fragments: Not set
Fragment offset: 0
Time to live: 249
Protocol: UDP (0x11)
Header checksum: 0x1e63 [correct]
Source: 172.16.101.251 (172.16.101.251)
Destination: 172.16.101.10 (172.16.101.10)
User Datagram Protocol,
Source port: 5060 (5060)
Destination port: 5060 (5060)
Length: 435
Checksum: 0x6c94 [correct]
Session Initiation Protocol
Request-Line: REGISTER sip:172.16.101.10
SIP/2.0
Method: REGISTER
Resent Packet:
True
Suspected resend
of frame: 34
Message Header
Via: SIP/2.0/UDP
192.168.10.52:5060;branch=z9hG4bK9749dfca14c0ffb2
From: 23456
<sip:23456@172.16.101.10;user=phone>;tag=2971075767
SIP Display info: 23456
SIP from address: sip:23456@172.16.101.10
SIP tag: 2971075767
To: 23456 <sip:23456@172.16.101.10;user=phone>
SIP Display info: 23456
SIP to address: sip:23456@172.16.101.10
Call-ID:
3431569068@192.168.10.52
CSeq: 1 REGISTER
Contact: 23456
<sip:23456@192.168.10.52:5060;user=phone;transport=udp>;expires=300
Contact Binding: 23456
<sip:23456@192.168.10.52:5060;user=phone;transport=udp>;expires=300
URI: 23456 <sip:23456@192.168.10.52:5060;user=phone;transport=udp>
SIP Display info: 23456
SIP contact address: sip:23456@192.168.10.52:5060
User-Agent: Cisco
ATA 186 v3.2.1 atasip (050616A)
Content-Length: 0
No.
Time
Source Destination
Protocol Info
533 152.674292 172.16.101.10
172.16.101.251
SIP Status: 401 Unauthorized (0
bindings)
Frame 533 (432 bytes on wire, 432 bytes captured)
Arrival Time: Nov 3, 2005
11:32:02.281970000
Time delta from previous packet:
0.001347000 seconds
Time since reference or first frame:
152.674292000 seconds
Frame Number: 533
Packet Length: 432 bytes
Capture Length: 432 bytes
Protocols in frame: eth:ip:udp:sip
Ethernet II, Src: Dell_17:ea:82 (00:14:22:17:ea:82), Dst:
Cisco_b5:15:f0 (00:04:c1:b5:15:f0)
Destination: Cisco_b5:15:f0
(00:04:c1:b5:15:f0)
Source: Dell_17:ea:82 (00:14:22:17:ea:82)
Type: IP (0x0800)
Internet Protocol, Src: 172.16.101.10 (172.16.101.10), Dst: 172.16.101.251
(172.16.101.251)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x60 (DSCP
0x18: Class Selector 3; ECN: 0x00)
0110 00.. =
Differentiated Services Codepoint: Class Selector 3 (0x18)
.... ..0. =
ECN-Capable Transport (ECT): 0
.... ...0 =
ECN-CE: 0
Total Length: 418
Identification: 0x0000 (0)
Flags: 0x04 (Don't Fragment)
0... = Reserved
bit: Not set
.1.. = Don't
fragment: Set
..0. = More
fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: UDP (0x11)
Header checksum: 0x9988 [correct]
Source: 172.16.101.10
(172.16.101.10)
Destination: 172.16.101.251 (172.16.101.251)
User Datagram Protocol,
Source port: 53492 (53492)
Destination port: 5060 (5060)
Length: 398
Checksum: 0x0ad1 [correct]
Session Initiation Protocol
Status-Line: SIP/2.0 401 Unauthorized
Status-Code: 401
Resent Packet:
True
Suspected resend
of frame: 480
Message Header
Via: SIP/2.0/UDP
192.168.10.52:5060;received=172.16.101.251;branch=z9hG4bK9749dfca14c0ffb2
Call-ID:
3431569068@192.168.10.52
From: 23456
<sip:23456@172.16.101.10;user=phone>;tag=2971075767
SIP Display info: 23456
SIP from address: sip:23456@172.16.101.10
SIP tag: 2971075767
To: 23456
<sip:23456@172.16.101.10;user=phone>
SIP
Display info: 23456
SIP to address: sip:23456@172.16.101.10
CSeq: 1 REGISTER
WWW-Authenticate:
DIGEST realm="CISCO", nonce="4369a82d",
qop="auth", algorithm=MD5
Content-Length: 0
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