Added TODO comments for most of magic values found in RTP code.
These should be replaced with proper defines.
Merge remote-tracking branch 'origin/master'
Continued websocket support in osscore.

Implemented all server side functionality.
Clientside support is not implemented yet as it is not needed at this stage.

Registrations/De-registrations work from a websocket client. Calls to/from websocket
clients vs. regular sip client via ossb2bua get through but SDP negotiation fails.
Merge remote-tracking branch 'origin/master'