Dushyant Dhalia wrote:
> In 3GPP specs, related to IMS procedure, it's written that P-CSCF sends
> the SUBSCRIBE request to I-CSCF which in turns finds the address of
> S-CSCF through Cx query. My question is why can't P-CSCF send the
> SUBSCRIBE directly to S-CSCF using Service-Route it received during
> Registration.
A SUBSCRIBE to *what*? The Service-Route gets to the UAC's own S-CSCF.
That's only useful if the UAC is subscribing to its own AOR. That might
be useful for reg event subscriptions, and a few other odds and ends,
but not in general.
In any case, the use of the Service-Route is the responsibility of the
UAC, not the P-CSCF. If the UAC has used it, then there will be a Route
header in the request, which will influence with the P-CSCF does with
the request.
Paul
_______________________________________________
Sip-implementors mailing list
Sip-implementors@lists.cs.columbia.edu
https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
