[SIPForum-discussion] From field in SIP header

Fredrik Sandedal fredrik.sandedal at enera.se
Fri Nov 30 09:24:39 UTC 2007



Thanks for your answer.


Do you mean that the IP references in the SDP should change when the
packets pass the firewall?

In the trace from the WAN-side of the firewall all IP references in the
SDP are to the local IP address. Not to the WAN address of the firewall.




Fredrik Sandedal, Enera


From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Rohin Koul
Sent: Friday, November 30, 2007 8:59 AM
To: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] From field in SIP header



I guess your firewall is behaving correctly... if you are not recieving
RTP check the SDP being exchanged.






On 30/11/2007, Fredrik Sandedal <fredrik.sandedal at enera.se> wrote: 



I have a question regarding the "From" field in the SIP header.


I send an INVITE request from within our LAN and through a SIP
supporting firewall to a SIP termination service.

The firewall changes IP-address of the "Contact" field from
<>  to the firewall's WAN IP but the "From" field
still has the LAN IP-address.



From: <sip:02073367100 at>;tag=....

Contact: <sip:02073367100 at>


WAN (after passing firewall)

Via: SIP/2.0/UDP 88.131....:5060;branch=...

From: <sip:02073367100 at>;tag=....

Contact: <sip:02073367100 at 88.131....:5060>


Is this a correct behavior? The reason I'm asking is because I do not
receive any RTP traffic from the SIP termination service. 


Kind regards,

Fredrik Sandedal, Enera


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