The relay data of the program-controlled exchange is divided into two parts: voice channel data and signaling data. Voice channel data is used to establish voice channels in the local office, and signaling data is used to establish voice channels with other offices. For example, when TUP is opened between offices, data such as routes and sub-routes belong to the local office to establish voice channels, while MTP data is used to establish voice channels with other offices. The concepts involved in relay data include: office direction, destination signaling point, route, sub-route, route selection source code, and route selection code.
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