| http://www.w3.org/ns/prov#value | - Figure 1 represents an example network with Cisco PGW 2200 Softswitches interconnecting customer VoIP islands and providing an interface to the PSTN; customers are interconnected through protocols, such as session initiation protocol (SIP), H.323, and QSIG. If QSIG is being used, QSIG feature transparency is needed when calls complete via the Cisco PGW 2200 Softswitch and when QSIG signaling is us
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