[SIPForum-discussion] From field in SIP header

[Fredrik Sandedal]

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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