1. IMT Carrier Architecture +----+ ----> +1 (H.248)| | Device +---- | GW1| ----> +1703,+1571... Control| | | | +----+ ----> +1202,+1703...[TG1] | | IMT | +----+ ----> +1 (SIP) +-----+ | | | +----------->| MGC |----+-----| GW2| ----> +1540,+1804... | +--+--+ | | | | | | +----+ ----> +1202,+1703... [TG1] | | | Call +----------+ | | IMT Setup | | | | +----+ ----> +1 (SIP) | Routing | | | | | -------->| Proxy | | +-----| GW3| ----> +1202555, +122544... | (LS) | | | | +----------+ | +----+ ----> +44 | | | SS7 | | +------------------------> TO PSTN | | | | +----+ PRI (B&D) | +-------------------------->| GW4| ----> +1202533 | +----+ | (SIP) | +----+ MF +-------------------------------> GW5| ----> +1703989 +----+

2. GWREG advertises the availability of _______ Gateway availability –MGC advertises its GWs availability –Smart GWs availability known directly Route availability (+1212555) –Are all MGC routes for +? Why express preference? –Also other address families (CIC, NP) Trunk group availability –Trunks associated with physical interfaces –CSI states (blocked locally/remotely, idle, etc) –Availability of routes predicated on trunk groups But often not on a single GW

3. Qualities of TGs Static Attributes Directionality Protocol used over trunk Reachable carrier(s) Reachable switch (PC/CLLI/LRN) Telephone number prefixes Total Capacity –Actually static? Dynamic Attributes Blocking state Current capacity