Thiel,
So just doing some in house testing on my system before getting on remote with the customer..
I have never been able to add different Group IDs for SIP URI.. I can only have the one that corresponds with my SIP Line.
For example my SIP Line number is 20, the only group ID that ever seems to work is 20. We have 8 SIP trunks, so not sure what I'm missing here.
If you could shed some light on what the SIP URI config should look like it would be much appreciated.