Abstract: Systems and methods for dynamically optimizing the fidelity of a speech signal received from a wireless telephony device and transmitted through a packet-switched network. In an exemplary embodiment, at least one Quality of Speech (QoS) transmission characteristic is determined for a packet-switched network intermediate to the a first Media Gateway (MGW) and a second MGW; the fidelity of speech transmitted through the packet-switched network being a function of the QoS transmission characteristic. A speech codec is dynamically-selected as a function of the QoS transmission characteristic of the packet-switched network. The speech signal is encoded into speech data using the dynamically-selected speech codec, and transmitted through the packet-switched network from the first MGW to the second MGW. The second MGW decodes the speech data using the dynamically-selected speech codec.

Abstract: A communications system (36) and method (60, 80) of serving subscribers having an originating network (14) in communication with a terminating network (32) via a core network (24). The core network (24) includes a plurality of external gateways (40, 42, 44) each adapted to route calls therebetween, with each gateway (40, 42, 44) having at least one codec (50, 52, 54). The communications system (36) includes a network node (37) for processing call requests from the subscribers having a particular codec type, wherein available gateways (40, 42, 44) are ranked based on gateway codec availability, the core network (24) being adapted to route a call as a function of the ranking.

Abstract: A telecommunications system and method is disclosed for decreasing the average call setup time in a cellular network by using an Internet Protocol based cellular network. Call information (such as routing information, channel types, etc.) for a particular call initiated by a calling Mobile Station (MS) can be stored in a call cache within a serving Mobile Switching Center (MSC) to immediately allow the same call to be re-established without tying-up circuits. A call cache identifier (CCI) is assigned to that call cache and passed to the calling MS. When the MSC receives a call from the calling MS, the MSC determines whether a CCI is included with the call. If not, call setup proceeds as normal, and the MSC creates a call cache for the call, assigns a CCI to the call cache and returns the CCI to the calling MS. If a CCI is received with the call, the MSC accesses the call cache associated with the received CCI, and uses the call setup information stored in the call cache to re-establish the call.