[Asterisk-Users] VoicemailMain can't read from phone keyboard!

[Wilson Pickett]

> This is almost ALWAYS a DTMF problem.  Usually a DTMF mode mismatch
> between the phone and Asterisk.  For most phones you want to use RFC2833
> for both the phone and for the entry for that phone in sip.conf.

Yep, and the BT will only work right with certain codecs. I think it's
iLBC that suddenly won't recognize DTMF while it works with the same
setting in ULAW, for example.

I keep forgetting why I don't use iLBC on the BT, set it up, and then
find DTMF b0rken with dtmfmode=info