[SIPForum-discussion] From field in SIP header

[DEEPAK SHARMA]

Hi Fredrick,

From Header remains the same in whole conversation.Your Logs seems to be
correct in respect to FROM header.

You will note that TO header also behaves in same way as of FROM. To differs
from FROM in the way that when Terminating party replies to INVITE with 180
Ringing, then it appends a "TAG" filed after this.

for ex: *To: <sip:ada at language.org>;tag=65a3547e3*        *⇐Tag added by
Called Party*

Hope it helps you .



On Nov 30, 2007 12:41 PM, Fredrik Sandedal <fredrik.sandedal at enera.se>
wrote:

>  Hello,
>
>
>
> 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 192.168.1.33to the firewall's WAN IP but the "From" field still has the LAN IP-address.
>
>
>
> LAN
>
> From: <sip:02073367100 at 192.168.1.33:5060>;tag=….
>
> Contact: <sip:02073367100 at 192.168.1.33:5060>
>
>
>
> WAN (after passing firewall)
>
> Via: SIP/2.0/UDP 88.131….:5060;branch=…
>
> From: <sip:02073367100 at 192.168.1.33:5060>;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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>


-- 
Thanks
Deepak Sharma
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