[SIPForum-discussion] Domain IP is same in TO & FROM header field.

Stewart Bunce Stewart.Bunce at telsis.com
Tue Jun 23 16:37:44 UTC 2009

A B2BUA basically terminates and then re-originates signalling information. In this case it appears to be using its own IP address as the originating IP addess in the FROM field. I believe this is perfectly valid behaviour as, technically, it is originating a new SIP call. This can actually be desirable behaviour as it can be used for hiding network topology from end users. In this case you would also expect to see  Record-Route, Route and Via headers stripped before sending the INVITE onwards. Of course in order for this to work the B2BUA has to have some internal mechanism for mapping between the inbound and outbound call legs.
Just out of interest what B2BUA are you using and what is it designed to do?

-----Original Message-----
From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org]On Behalf Of nitin kapoor
Sent: 23 June 2009 00:30
To: discussion
Subject: [SIPForum-discussion] Domain IP is same in TO & FROM header field.

Hello Friends,

I am facing the problem where i can see that when my UAC is sending the initial invite to my server(B2BUA), TO & FROM header field is correct but when my B2BUA is forwarding the same invite to next hop(termination end) then TO & FROM header field domain ip/name is different. I am not sure it is possible or not.  

TO & FROM in the intial invite.
From: <sip:6782617979 at>;tag=ea1a59c8-3dfd2e48-13c4-5506-22ae0b-3e082bb5-22ae0b
To: <sip:20805215519112887 at>

TO & FROM when B2BUA is forwarding the same request to termination end.

To: <sip:20805215519112887 at>
From: <sip:6782617979 at>;tag=3454088168-182424

And if it is possible then on which scenario its is possible??

Please help me to understand the issue.

I have attached the ethereal traces with the mail.

Nitin Kapoor

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