SIP was designed to be flexible enough to accomodate many different types of multimedia session applications. Given that, it's difficult to answer your questions (is SIP equivalent to ISUP? Where is the equivalent of the CCF in SIP? Does SIP use intelligent endpoints?) in the general case.
If you want to narrow down the problem domain a little bit, and talk specifically about implementing a traditional, carrier-oriented VoIP service, then we could safely say the following: 1. SIP can be used for both user-to-network and network-to-network signaling. So it replaces not just ISUP, but it may also replace the analog signaling on the line interface (assuming, of course, you have a SIP phone). 2. The CCF function would still be located in the core network. Some people refer to this as the softswitch, call server, or call session control function. The softswitch does typical call control (authentication, authorization, routing, accounting, etc.). 3. SIP allows for very intelligent endpoints, but if you're implementing a traditional telephony service, you may choose not to leverage that capability. Your endpoints may just be smart enough to implement a basic SIP stack (so certainly smarter than a POTS phone), but receive all of their services from the network. Hope that helps - g On 10/6/06, Ion <[EMAIL PROTECTED]> wrote: > > Hello everybody, > > In TDM we have the following model: > The user requests the CCF function located in "core network" by means of a > subscriber signaling for a connection service. Consequently, the CCF > function performs E164 routing+charging etc. and then uses the SS7 > signaling > (ISUP) to comunicate with the distant CCF in order to setup the requested > connection. > In SIP model I understand that SIP is the counterpart of ISUP, and that > the > inteligence is pushed towards the end user. > My questions are: > Is the SIP model that I described above valid? > What happens with the CCF function: is it included in SIP protocol or does > it still exist as a dedicated application, similar to the TDM model? > > Thank you! > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
