Enhancement: opus codec transcoding at rtpengine for both inbound outbound call

[vdharashive]

Currently calls going to webrtc client is using pcmu codecs since freeswitch is setting priority pcum as high

For outbound call from jambomz to webrtc client jambonz send pcmu and webrtc client is acknowledge with opus in this case one leg of call using opus and other pcmu rather it should use opus based on client negotiations

Similarly is case for inbound

It would be good feature to have both inbound and outbound call rtpengine can manage opus for webrtc client and internally pcmu with freeswitch

So rtpengine needs to have transcoding enables

Inbound call opus to pcmu
Outbound call pcmu to opus