[Asterisk-Users] TDM card and voicemail volume

[Rich Adamson]

> I saw some conversation about this in the archives, but nothing
> definitive.
> 
> If a call comes in over a CO line via the TDM400P, the Comedian Mail
> recording volume is so low it's inaudible.  Calls coming in via SIP or
> IAX do not have this problem.
> 
> Does anyone have any information on this issue?

Its still a problem. It seems the greater the distance from the Central
Office, the greater the problem (due to the cable loss to the Central
Office plus the problem with the TDM card). 

Part of the problem is there are very few people that understand zaptel,
wctdm, drivers, hardware (chipsets) and transmission engineering. Actually, 
there is only one person and he is now very busy doing other things that 
are apparently more important.

As someone else mentioned, changing to wav format improves the levels a
little bit, but its certainly not a fix. There are no known work arounds.