[Asterisk-Users] TDM400 audio problems

[Rich Adamson]

> Sorry everyone, I know this has been hashed over a bunch of times but I
> can't find anything that pertains to specific cracking and popping on the
> FXO modules of a TDM04.  This happens on inbound or outbound calls.  This is
> the first install I have done with a TDM card for FXO modules so please, be
> kind if I am missing something really simple.
> 
> Damn I wish everyone wanted t-1's or pri's!
> 
> Everything sounds great UA to UA and the dialplan works but any calls
> through the TDM card sound like crap.  Getting bunch of crackling and
> ticking in the audio.  I swapped the tdm card with a spare x100 clone that I
> had lying around and the audio is fine.  This is a p4 3.4 proc with 4 gig of
> DDR2 on an Intel server board.

Usaually those types of problems are associated with motherboard interrupt
issues. Might try analyzing the following commands:
 
cat /proc/interrupts
 (check to see if wctdm is sharing an interrupt with something else. If so,
  try to move the tdm card to another pci slot, or, look in your bios 
  setup to disable unused interrupts.)

run 'zttool' to see if you have any irq misses. If so, those need to be
resolved.