[SIPForum-discussion] From field in SIP header

[Ankit Gupta]

you can check with your network analyzer(Ethereal) in which port it is
coming ............after it media proxy redirected RTP packets  till
you.

nothing wrong with your  from field.

 







On Fri, 2007-11-30 at 08:11 +0100, Fredrik Sandedal 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
> 192.168.1.33 to 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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