WireShark extract:
500 243.086719000 XX -> YY MGCP 155 NTFY 28173 mobicents/asr/3@YY:2427 MGCP 1.0 mgcp.param.observedevents == "AU/oc(rc=328)"
502 243.267512000 ZZ -> YY RTP EVENT 62 Payload type=RTP Event, DTMF Pound #
503 243.287524000 ZZ -> YY RTP EVENT 62 Payload type=RTP Event, DTMF Pound #
504 243.307509000 ZZ -> YY RTP EVENT 62 Payload type=RTP Event, DTMF Pound #
505 243.327526000 ZZ -> YY RTP EVENT 62 Payload type=RTP Event, DTMF Pound #
506 243.347495000 ZZ -> YY RTP EVENT 62 Payload type=RTP Event, DTMF Pound #
507 243.347663000 YY -> YY MGCP 165 NTFY 28174 mobicents/asr/3@YY:2427 MGCP 1.0 mgcp.param.observedevents == "AU/oc(rc=100 dc=# pi=0)"