RTP support

[minhtuan1407]

First of all, I want to say thank you for creating sipexer, and it would be great if this can have audio support, to specific a wav file for sending audio

[miconda]

Not involved much in media plane myself, so I can't make any promise, but I leave it here as a feature request. Let's see if something comes out in the future.

[minhtuan1407]

Great, thank you @miconda

[bundasmanu]

+1 here