asterisk users - Jan 2004 - Multiple voices on 64K channel (was) simple question...

On Thursday, January 22, 2004 9:55 PM, Jess Magnaye 
[SMTP:jess@arretni.com] wrote:
> in telco world, there's like 64kbps per channel and voice can be
> carried on a 16kbps channel.  is it possible to configure asterisk to
> make 4 extensions (ATAs example), to call out using single FXO port
> at the same time?  if that is possible, then is it also possible to
> make t1-pri to be capable of transmitting 4x23ch simultaneous
> calls..?
In short you can not combine 4 calls on one FXO port and neither can 
the telcos. An FXO port, could not handle 4 channels of signaling since 
signaling is done either inband or with voltage changes such as 
polarity reversals. You would need other methods for multiple channels. 

On a 64K digital channel this is possible but only if both ends of the 
64K channel have the capability. I don't believe any of the common PRI 
ISDN services could do it. As it stands now, asterisk could not do 
this.

It would probably be better to explore trunking technologies such as 
low bandwidth codecs over IAX2.

Don Pobanz