From reading around, it sounds like rfc2833 is the preferred DTMF mode. However, in this mode, my snom320 phones and asterisk 1.4.4 don’t want to place nicely.
If I dial my voicemail extension, and then punch in my password (“999” for example), the console will show “Incorrect Password ‘9999999999999999999’ for user…”. Then sometimes, it won’t even recognize any digits I punch in. And when I do make it into voicemail, half the time it doesn’t recognize my menu selections.
Should I just switch to inband and disable GSM in my sip.conf?