[OpenSER-Users] [OT] Do ITSP SIP_PSTN gateways allow REFER?

[Klaus Darilion]

Iñaki Baz Castillo schrieb:
> Hi, I will connect my OpenSer with a Nortel (SIP to PSTN gateway) for 
> incoming/outgoings call to/from PSTN.
> 
> I have a doubt: if an OpenSer user (200 at mydomain.org) receives an incoming 
> call from gateway, could he REFER the call to 201 at mydomain.org?
> 
> This is: do ITSP gateways allow REFER to SIP users subcribers to my OpenSer?
> I understand they could not accept REFER's to PSTN number because accounting 
> issues (gateway UAC receving a REFER and calling to PSTN?).

Usually it depends on the configuration of the gateway. Thus, I would 
add some screening of REFER and 3xx to the proxy.

regards
klaus