Hi Expert, I have a scenario here can anyone help me to undrstand is the behaviour is correct on both cases?
FIRST CASE: • User A calls User B • Negoziation for EVS codec • User A put in hold User B • REINVITE from User A, contains sendonly, with only EVS (codec negotiated and used). • REINVITE arrives to User B, it contains sendonly with all the codecs handled by volte network in the following order: EVS, AMR WB, AMR NB. • User B answer with 200 OK just with EVS and the call has not any call quality issue. SECOND CASE: • User B put in Hold User A • User B sends REINVITE with sendonly containing only EVS, • REINVITE arrives to User A with sendonly and it contains all the VoLTE codecsin the following order: AMR WB, EVS, AMR NB. • User A answer with 200 OK recvonly that contains only AMR-WB because is the first in the list and the call quality has degraded So is the codec negotiation in both cases OK I am asking since in one case call quality is OK and in other case call quality is NOK? Any RFC standard or reference to understand completely the codec order and priority to handle? _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
