3 Nov
2005
3 Nov
'05
5:12 p.m.
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(a)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(a)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
Ritesh Jalan
Senior Engineer - Business Solution
Net4India Ltd.
D-25 Secto3
Noida - 201301
India
INDIA
Tel: 91-120-5323500
Fax: 91-120-5323520
URL: http://www.net4.in
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