I am not bypassing it, all calls transverse the SBC for signaling and media. It adjusts the SIP Message and SDP accordingly.
The problem I am having is that because I am trying to keep all configuration on the PBX itself, routing, normalization, classification and from the PBX's POV it should only view the SBC as a Proxy, not as a trunk. So in my SBC configuration the WAN is blind to all internal network information. Internally though, everything stays intact except for the contact host part (changed to the SBC), and the Media addressing in the SDP. VIA headers are left, User-Agent, etc. It is a BBUA but w/ a single direction transparency.
I have a total of 5 SIP Trunks I am terminating. Some of them have a different dialplan because they are terminating in a different country.
Therefore on Inbound calls I would like not to look at layer 3 addressing for Trunk classification but instead look at destination telephone number, or other criteria. This way I can pass it to a different context for number manipulation.
E.g. I want the US trunk to be pass through, "from-pstn-e164-us" but the German trunk I obviously would not want it to.
I can get incoming calls working if I declare :
[+4930*********2]
host=sbc.home
type=peer
context=from-trunk
But all incoming calls regardless of what Trunk I would like them to route through, they come in on this one.
For example I would like my US trunk to hit this:
[+1732*******]
host=sbc.home
type=peer
context=from-pstn-e164-us
Hopefully that makes sense?
Thanks again,
- Steve