[Asterisk-Users] Erratic DTMF on E1/PRI (continuation of Strage bip on ISDN/PRI)

[Brian Capouch]

Paulo Mannheimer wrote:
> At the same site, DTMF recognition is functioning badly, sometimes
> duplicating digits and sometimes totally missing others.
> 
> We have checked already /proc/interrups, there is no interrupt being
> shared.
> 

FWIW right now this problem is the most vexing one we're facing, 
actually eclipsing the "SIP behind NAT" deal as the one generating the 
most complaints from our users.

My guess is in our heavily-used installations somewhere on the order of 
one call in ten (we're using fairly nice AT&T instruments) is either 
dropping DTMF digits or doubling them, and both are perceived as equally 
serious to the user, especially in those cases where the difference 
causes unintended consequences by matching a different element in the 
dialplan.

Thx.

B.