We took the plunge this week and deployed Asterisk to over 30 workstations. We’re using a TDM2400 with 12 FXO channels on a Dell 2850. The card is on a clean IRQ and runs without misses. The handsets are all Polycoms, ranging from 301s to IP4000’s.
Everything is working great with the exception of an occasional clipping/choppy PSTN call. The choppiness is only heard on our side, the outside caller doesn’t seem to notice at all. I thought it was isolated to a particular Zap channel; but that theory evaporated today when it presented itself on a different one.
All the SIP to SIP calls are amazingly clean.
Bandwidth is not an issue.
The only thread I can pull from this is that it is isolated to a few phone #'s, but its not a rule, it occured yesterday while I was on a call home, when its normally crystal clear.
Would the echo cancellation module be contributing to this?
Is it possible I have a bad FXO module (4 channels each on the TDM2400)