I have a couple of Linksys PAP2T-NA & Grandstream HT-502 extensions that are receiving random DTMF tones on their side, but that are not heard by the outside party. I have been using Asterisk 1.6.6 through 1.6.10 and have always had this issue. I am only using SIP on the Asterisk server and all extensions and trunks are set to rfc2833; outside of this issue DTMF operation works fine. I've included the Asterisk DTMF debug lines during an occurrence of this issue for extension 5211. The debug lines seem similar to a normal DTMF event with exception of the "...but want minimum 80..." message. Any ideas?
[2010-07-27 10:34:42] DTMF[9744] channel.c: DTMF begin '1' received on SIP/5211-00000078 [2010-07-27 10:34:42] DTMF[9744] channel.c: DTMF begin passthrough '1' on SIP/5211-00000078 [2010-07-27 10:34:42] DTMF[9744] channel.c: DTMF end '1' received on SIP/5211-00000078, duration 39 ms [2010-07-27 10:34:42] DTMF[9744] channel.c: DTMF end accepted with begin '1' on SIP/5211-00000078 [2010-07-27 10:34:42] DTMF[9744] channel.c: DTMF end '1' has duration 39 but want minimum 80, emulating on SIP/5211-00000078 [2010-07-27 10:34:42] DTMF[9744] channel.c: DTMF end emulation of '1' queued on SIP/5211-00000078
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