Cell Relay Archive

[Alex Hardisty <alex@pqm-cons.demon.co.uk>]

In article <585apo$rrp@faraday.ee.latrobe.edu.au>, Ashley Cummings
<ash@ee.latrobe.edu.au> writes
>I was wondering if someone out there (one of the gurus) could explain
>to me how the "Call Reference" Information Element (IE) passed in 
>connection control signalling differs from the "Connection Identifier"
>IE. To me it seems that with the Connection Identifier IE, the 
>call reference IE is redundant. This is obviously not the case, but 
>for the life of me I can't see why?

Because one call may involve several connections e.g., in point-to-
multipoint applications. In this case, messages relating to the
different connections would each have different connection id's but the
same call reference value.

The other possibility (although not defined I think) is the possibility
to set a connection, use it for several calls, and then clear it. This
may be relevant for B-VPN voice applications.


Alex Hardisty (alex@pqm-cons.demon.co.uk)
PQM Consultants
Chepstow, UK  tel: +44 1291 626 180 / fax: +44 1291 626 190