FTDM_CAUSE_PROTOCOL_ERROR  322 src/ftmod/ftmod_r2/ftmod_r2.c 	case FTDM_CAUSE_PROTOCOL_ERROR:
FTDM_CAUSE_PROTOCOL_ERROR  870 src/ftmod/ftmod_r2/ftmod_r2.c 	ftdmchan->caller_data.hangup_cause  = FTDM_CAUSE_PROTOCOL_ERROR;