[OpenSIPS-Users] Feature request - pseudo-variable for destination IP address

[rob.dyck at telus.net]

I was looking for something similar to the $si PV but for the destination IP address. Either it doesn't exist or I am blind. I can't find things in the refrigerator either.

The motivation.

I have a working instance of Opensips with a basic residential configuration. I extended it to allow calling UAs on the LAN from the outside. It is a typical residential LAN without a fixed IP address. Dynamic DNS is working for me. I read the tutorial about Opensips behind NAT. Following the recommendations there I was able to setup rtpproxy, the advertised address and an alias for my Opensips. Initial testing using a softphone on a laptop using either WiFi or a mobile phone tethered to the laptop worked well. However it seems that some UAs will not accept a domain name in the SDP connection. The UAs that failed could be made to work by coding in an IP address. This is not a satisfactory solution because the router's address may chaange. There is probably some convoluted way to import the needed address into the script.  A pseudo-variable representing the destination IP address of the received INVITE or 200 OK could then be passed as the advertised address to the rtpproxy module.

Thank you for having a look.
Rob