So long story short here is the issue were running into. Sorry for the crappy messaging diagram.
//when going on hold.
Avaya INVITE to FS no SDP
FS 100 trying no SDP to Avaya
FS 200 OK w SDP to Avaya
Avaya ACK w SDP(a=sendonly) to FS
//were now on hold.
//going off hold where we run into the one way audio.
Avaya INVITE to FS no SDP
FS 100 trying no SDP to Avaya
FS 200 OK w SDP (a=sendonly) to Avaya
Avaya ACK w SDP (a=recvonly) to FS
We get a recvonly from Avaya so were in listen mode instead of sendrecv.
This is a new issue since we upgraded from and older version to 1.6. The previous version of FS we didnt see the a=sendonly in the 200 OK when going off hold so i thought that may be configurable in the newer version to leave those media attributes out of the SDP?
Thanks!!