Subject: RE: CAS

From: "Yaakov Stein" <[email-masked]>
Date: Thu, 18 Dec 2003 18:26:50 +0200

>  What document specifies the method to transport 6.711 voice with CAS ? 
 
You can transport an entire E1 or T1 with or without CAS using SAToP
( http://www.ietf.org/internet-drafts/draft-ietf-pwe3-satop-00.txt).
However, this method doesn't really know whether there is G.711
or not, or whether or not there is CAS.
 
You can transport structured n*DS0 with or without CAS using either
the AAL1 mode of 
http://www.ietf.org/internet-drafts/draft-anavi-tdmoip-06.txt
or 
http://www.ietf.org/internet-drafts/draft-vainshtein-cesopsn-07.txt.
 
In both cases the fractional E1/T1 or n*DS0 is sent
in structured fashion, and CAS is handled via special
signaling substructures.
 
Finally, you can send N voice (or similar low-rate signals
occupying  64Kbps) channels using the dynamic (AAL2) mode of 
http://www.ietf.org/internet-drafts/draft-anavi-tdmoip-06.txt .
In this case the transport only takes place when the channel
is "active" (as determined by the CAS signaling).
Optionally one could suppress the channel via VAD.
 
Y(J)S