Add the rejected media stream and its attributes in the local SDP for answer, REF 14613

Yalu Zhangrequested to merge
bug-14613-rdkb into asterisk_rdkb 
Add the rejected media stream and its attributes in the local SDP for answer, REF 14613

The attributes of the rejected media stream were missing in SDP answer before. With this
commit, all attributes from the SDP offer for the rejected media stream are kept in the
SDP answer.
Edited by Yalu Zhang

Merge request reports