[Serusers] SRC Port change

Ritesh Jalan ritesh.j at net4.in
Thu Nov 3 07:12:35 CET 2005


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 at 172.16.101.10;user=phone>;tag=2971075767

            SIP Display info: 23456 

            SIP from address: sip:23456 at 172.16.101.10

            SIP tag: 2971075767

        To: 23456 <sip:23456 at 172.16.101.10;user=phone>

            SIP Display info: 23456 

            SIP to address: sip:23456 at 172.16.101.10

        Call-ID: 3431569068 at 192.168.10.52

        CSeq: 1 REGISTER

        Contact: 23456
<sip:23456 at 192.168.10.52:5060;user=phone;transport=udp>;expires=300

            Contact Binding: 23456
<sip:23456 at 192.168.10.52:5060;user=phone;transport=udp>;expires=300

                URI: 23456
<sip:23456 at 192.168.10.52:5060;user=phone;transport=udp>

                    SIP Display info: 23456 

                    SIP contact address: sip:23456 at 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 at 192.168.10.52

        From: 23456 <sip:23456 at 172.16.101.10;user=phone>;tag=2971075767

            SIP Display info: 23456 

            SIP from address: sip:23456 at 172.16.101.10

            SIP tag: 2971075767

        To: 23456 <sip:23456 at 172.16.101.10;user=phone>

            SIP Display info: 23456 

            SIP to address: sip:23456 at 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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