From above at beginning, you had: scts2.sc_numts = 2; scts2.sc_tsarrayp = &ts2; if ( ipm_GetXmitSlot(voice[index_voice2].deviceInfo[IPM].devH, &scts2, EV_ASYNC) 0 ) { The line should be: scts2.sc_numts = 1; You are not passing two timeslots in this case. Its only 1. So after you get both events for the get xmit slot info, you can call the ipm_listen in async mode on each channel passing the opposing channel timeslot information. I see you were caling them in sync in this case. Then make sure you call ipm_startmedia afterwards to initialize the RTP stream for each channel when the call is answered. Jeff
↧