[asterisk-users] Noise in caller handset when dialing out (with dahdi 2.6.0)

[Richard Mudgett]

> On a brand new system, I met an issue I've never met before.
> 
> My setup is :
> debian 6.0.3
> asterisk 1.8.8.1
> dahdi 2.6.0
> libpri 1.4.12
> freepbx 2.9.0.4
> TE420FB (with hardware EC)
> 
> This is the very first time I'm using Freepbx and the whole
> configuration was first generated by a "make samples" command.
> 
> When a SIP hardphone dials another SIP hardphone, everything is OK.
> When the same SIP hardphone dials an external number, there is a
> quite
> loud noise that can be heard within the handset from the moment the
> digit sequence have been sent to the  moment any party hangs up. The
> other party doesn't hear this noise.
> (It's not easy for me to describe this noise)
> 
> 
> I don't have any idea of where to look at.
> What would you suggest or recommend ?

At a guess this sounds like a possible mismatch between A-law and
mu-law companding.  When this happens, you hear something like static
only when someone is speaking.

Richard