Forum Post: RE: gc_hmp_hold_retrieve demo project - the call is successful but the voice file is not heard

Jeff, It is: G.711ulaw. See the line below from the CFG file. iptB1T1    SIP   Out   ipmB1C1   SIP:userA@146.152.65.211  dxxxB1C1  REQH   0    G.711ulaw  20   N/A  G.711ulaw  20   N/A Thanks. Mike