We are trying to get a SIP trunk established between a cisco 2811 and a provider using a Carrius AppTrigger Compleat 200...I am not familiar with providers equipment but here is the issues thus far:
Call from carrier completes to sip gateway.
Call from gateway doesn't complete and gateway recieves a 403 Forbidden message.
Teleco provider says the problem is in the cisco invite message..the source port is not 5060..some random number...I didn't think this would be an issue but when I trace a call coming into the gateway their device is sourcing on port 5060..when a trace of a call going to the provider is looked @ the source port is not 5060...
The teleco's equipment understands that this is a sip call but doesn't allow it..
See attachment for traces of telco and cisco equipment:
So is it possible to change the source port on the sip invite to be 5060 or is this not the underlying issue...any help would be appreciated...