[SIPForum-discussion] From field in SIP header

[Fredrik Sandedal]

Hello, 

 

Thanks for your answers

 

I first receive a 100 status message and then and 183 Session progress.

The 183 status message has of course another Contact field. Contact:
<sip:CALLED_PHONE_NUMBER at 194.0.210.139>

The IP 194.0.210.139 is of course not the same as where I send my INVITE
request since I send them to a SIP proxy. 

 

After this I start sending RTP packets to 194.0.210.139

 

Regards,

 

Fredrik Sandedal, Enera

________________________________

Sent: Friday, November 30, 2007 9:09 AM
To: Fredrik Sandedal
Subject: RE: [SIPForum-discussion] From field in SIP header

 

Hello Fredrik,

what is the response to this invite?
I think that the IP in the "Contact" field is used to send the message,
is it?


Regards,


Andrea








________________________________

Date: Fri, 30 Nov 2007 08:11:14 +0100
From: fredrik.sandedal at enera.se
To: discussion at sipforum.org
Subject: [SIPForum-discussion] From field in SIP header

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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