Re: draft-kuthan-sip-derive
"Victor Pascual Ávila" <[email protected]>
| Newsgroups | gmane.ietf.sip |
|---|---|
| Message-ID | <[email protected]> |
Hendrik, On Sat, Nov 15, 2008 at 11:54 AM, Hendrik Scholz <[email protected]> wrote: > How would the TDM interworking work? > Look at 'Figure 1: Overview of Operation' and assume this: > > - Call SIP->PSTN > > The callee is in the PSTN/TDM world and proxy 2 acts as > a gateway. > In this case the callee would never send a SUBSCRIBE. > If there is no authentication/authorization for the call > the gateway may opt to subscribe to the user? > > - Call PSTN->SIP > > The caller is on the TDM side and proxy 1 acts as a PSTN to SIP > gateway. The callee sends the SUBSCRIBE which ends up at > the edge on proxy 1. > What should the proxy do? > a) Respond on behalf of the caller > b) do not support the Dialog event package and respond > with 489 to the SUBSCRIBE > c) do some magic based on information conveyed on the > TDM side? This is a limitation. IMO the GW could handle it for you in a useful way but I see two issues: - Different GWs might be used for the incoming INVITE and the outgoing SUBSCRIBE requests - Transitive trust (you do need to trust the GW) Cheers, -- Victor Pascual Ávila _______________________________________________ Sip mailing list https://www.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use [email protected] for questions on current sip Use [email protected] for new developments on the application of sip