Hi,

  As you may work out Im not an expert in this, hopefully for those of you that 
are this is a pretty straight forward question.

Im trying to implement something like this:

Cisco_as5300    <----->    OpenSER    <------>    Atersisk
PSTN Gateway               SIP Proxy                    PBX
                                            ^
                                      Radius


I am attempting to setup OpenSER as a SIP proxy for a Cisco PSTN Gateway, on 
the other side of OpenSER I have an Asterisk system. My confusion centres 
around the connection between the end users (SNOM or whatever) which hang off 
Asterisk and the connection between Asterisk and OpenSER. I have configure 
Asterisk to SIP register to OpenSER, all works ok here and Asterisk sees 
OpenSER as a SIP peer and channel. The bit Im not getting is that when someone 
dials a number from a handset connected to Asterisk that needs to route out via 
OpenSER, Asterisk seems to pass the username and password credentials of the 
handset to OpenSER. Firstly if its going to do this, then what is the point of 
SIP registering Asterisk as its authenticating ever session as individual 
entities anyway, secondly this isnt scaleable :( it seems to mean I have to 
configure each SNOM user both in Asterisk and in OpenSER. All of which doesnt 
seem very logical, can anyone tell me if I'm doing something wrong or if Im 
approaching this in the wrong way or if I need to approach the problem in some 
other way...

The end goal of this is that Id like the ability to bill on a per SIP peer 
basis customer Asterisk boxes, I dont want to end up in a situation were I have 
to know about every SNOM a customer has.


many many thanks in advance, Im a bit stuck at the mo! thanks Andy.
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