[Asterisk-biz] Re: T1/DS1/ISDN PRI

[Herman Webley]

On Thu, 2005-04-28 at 17:47 -0400, Matt Roth wrote:
> Herman,
> 
> Thanks for filling me in on the circuit switched <-> packet switched 
> process.  I'll be taking a look into "show file formats" as well.
> 
> >In any case this process isn't resource consuming, unless the voice
> >stream is compressed when converting to VoIP.
> >
> Are you referring to transcoding the DS-0 channels (ie. G.711 µ-law <-> 
> G.729) or something else.  Either way, could you point out where this 
> process would occur in a TDM-VoIP gateway.  Here is my first-pass 
> diagram for reference (http://home.comcast.net/~mroth01/T1-CPE.gif).

When I say compression I am referring to the conversion of the raw sound
stream to a _compressed_ format. Compressed formats include g.729, iLBC,
etc. These take up less bandwidth, but computational cycles need to be
spent to perform the conversions.

Best regards,
Herman Webley