[SIPForum-discussion] From field in SIP header

[Fredrik Sandedal]

Hi,

 

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.


 

Regards

 

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

 

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 192.168.1.33
<http://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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