Доброго дня!
rtp_manual_rtp_bugs=IGNORE_DTMF_DURATION
может спасти отцов русской демократии в общем случае.
Но не факт.
Принесите побольше информации (версия, логи, по возможности - вообще дамп проблемного соединения).
Вот кусок из switch_types.h с некоторым пояснением
Код:
RTP_BUG_IGNORE_DTMF_DURATION = (1 << 6),
/*
Guess Who? ... Yep, Sonus (and who know's who else) likes to interweave DTMF with the audio stream making it take
2X as long as it should and sending an incorrect duration making the DTMF very delayed.
This flag will treat every dtmf as if it were 50ms and queue it on recipt of the leading packet rather than at the end.
*/