The PSTN Gateway provides the all-important ability to make PSTN calls to and from the APCO P25 network. Again built around a pair of mated elements for fault tolerance, it allows P25 units to make and receive calls to and from the PSTN. Responsible for translating ISUP (or E&M) signaling to and from the appropriate SIP messages as well as transcoding the RTP voice packets onto the PSTN, it can either be co-located with one of the base stations in the RFSS, or positioned anywhere in the network.

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