[asterisk-users] G729/MOH Quality

[Atis Lezdins]

Steve Underwood wrote:
> Darryl Dunkin wrote:
>> Does anyone have any opinions on the music on hold quality over G729?
>> The stock files seem to sound terrible over it, this is enhanced further
>> by calls coming from the PSTN via a Zaptel gateway. I am only using the
>> stock wav files and have not attempted to use much else so far.
>>
>> I've ruled out timing issues on the system generating the MOH itself
>> (ztdummy on the PBX itself, our Zaptel gateway is a separate Asterisk
>> server). There is no transcoding going on in the middle except via our
>> Zaptel/T1 gateway. When using G711 it sounds fine of course, but this
>> doesn't work well for remote sites with lower bandwidth connections.
>>
>> As of now, I'm torn between getting complaints from end users about the
>> music or killing it entirely (leaving people waiting in queues with dead
>> silence).
>>   
> 
> Music over G.729, or any other similarly low bit rate codec sounds 
> bloody awful. The only thing you can do to mitigate this is choose 
> simpler music. A single voice singing sounds OK - that's what the codec 
> is optimsed for. A singer with a guitar doesn't usually sounds too bad. 
> As the music gets more complex it goes horribly downhill from there.
> 
> Steve

I've seen the same problem. Currently i have no need for that, but maybe 
anybody knows - where to get something more-or-less classic (like 
bundled MoH) for free or small price.

Regards,
Atis