[SIPForum-discussion] From field in SIP header

[Rohin Koul]

Hi,

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

Regards

Rohin


On 30/11/2007, 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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