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,
Src Port: 5060
(5060), Dst
Port: 5060
(5060)
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,
Src Port: 53492
(53492), Dst
Port: 5060
(5060)
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