SIP Integration mechanism

[giangndm]

SIP system is very complex with a lot of config and customization then I think we should have some general way to integrate with SIP system. Which need:

• Take advantage of atm0s-media
• Don't make amt0s-media too complex
• Allow user can implement our own logic

@marverlous811 give some idea about how to implement a RTPEngine compatible server for integrating with other SIP signaling library like: https://drachtio.org/ . With this method atm0s media only take care about RTP flow

Currently he working on PR: #359

[giangndm]

I just merged first version of SIP integration. More info can found here: SIP Integrate

Thank @marverlous811 for great contribution.

Next we will improve sample: https://github.com/8xFF/atm0s-media-sip-call-sample

[dhilipsiva]

Just sharing this assuming you might find this interesting: https://github.com/Televiska/rsip

[giangndm]

@dhilipsiva I used RSip in previous version, but it only SIP library then we need to build up PBX system from scratch. At this time I don't have enough time but it look very promised.