Might be nice to have additional helper code for VoIP signalling in the SDK.

From what I've been doing with VoIP bridging, I've found it's easiest to use an object representing calls. It might be nice to be able to listen for incoming calls, being provided with a call object to represent it, which can then be used to send and receive signalling specific to that call.

This could help make VoIP bridging more widespread since a number of bridges depend on this SDK.

Is there any interest in something like this?