Ask Your Question

I have packet bytes in SIP but I can not see the messages

asked 2024-01-24 01:43:21 +0000

Guillermo gravatar image

HI Fellows

I have the following doubt.

I received a pcap from another colleague I am seeing that the trace only has the frame and length, but when I view as packet bytes I can see couple of SIP information. I was trying different way to try to decode this packets, but I have not idea why I am not able to see it. Anything that I need to check in the frame and later do it to be able to decode and see the complete SIP messages?

Regards, Guillermo

edit retag flag offensive close merge delete


Hi Fellows, If someone has any hints just let me know.


Guillermo gravatar imageGuillermo ( 2024-01-29 15:37:03 +0000 )edit

Sharing a capture file goes a long way. An image (even if it was visible) doesn't reveil enough information.

Jaap gravatar imageJaap ( 2024-01-29 17:29:33 +0000 )edit

1 Answer

Sort by » oldest newest most voted

answered 2024-01-24 10:23:06 +0000

hugo.vanderkooij gravatar image

The most common issue is that someone runs tcpdump with the -f option but fails to add the -s 0 option. So you don't have the full packets.

edit flag offensive delete link more


Thanks a lot,

But there is any way to resolve from my site or I need to request the colleague to run the tcpdump back again?

The same thing is happening when I receive a trace for ISUP. I see the trace as DLT_User 162, then I set as the image and I am only seeing the CIC info.

image description

I really appreciate a lot all your help.

Regards, Guillermo

Let me know if you are able to see the attachment files.

Guillermo gravatar imageGuillermo ( 2024-01-24 13:51:31 +0000 )edit

DLT = User 15 (DLT=162) Payload protocol = isup Header size = 0 Header protocol = ? I don´t know if I need to define something here Trailer size = 0 Trailer protocol =? I don´t know if I need to define something here

Guillermo gravatar imageGuillermo ( 2024-01-24 13:55:07 +0000 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools


Asked: 2024-01-24 01:43:21 +0000

Seen: 89 times

Last updated: Jan 29