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Outgoing Calls
Call-by-Call Service selection is a feature for outgoing calls. It allows a group of B-channels to carry a variety of supported PRI services programmed in the Call-by-Call Services Table (see Sample Call-by-Call Services Table). The service selected is based on the digits dialed and the bearer capability (voice, data, or both) of the originating party.
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Where the Switch Type setting is LEGEND-Ntwk or LEGEND-PBX, outgoing calls on tandem PRI trunks are not routed using the features outlined in this section. Instead, Remote Access and/or ARS can be used for such routing, as well as UDP routing (see Uniform Dial Plan Features) for calls to extensions on networked switches. This cannot be changed unless the Switch Type setting is modified. |
Outgoing calls can be made by accessing a Personal Line, a Pool, or ARS. When a call is placed, the system determines whether the line accessed is a PRI facility. If so, the system performs digit analysis with the entries in the Network Selection Table (see Sample Network Selection Table and the Special Services Selection Table). The Network Selection table lists the prefixes for dial access to alternative long-distance carriers (for example, 10xxx). The Special Services Selection Table lists prefixes that represent special services, such as operator service or international dialing (0 or 00).
In addition, if the B-channel group for an outgoing call is programmed for Call-by-Call Service selection, the system performs digit analysis, with the entries in the Call-by-Call Services Table (see Sample Call-by-Call Services Table). The entries in this table indicate the service and tell the system how to delete digits and successfully route an outgoing call.
A sample of each of these tables follows. Refer to System Programming for information about programming these tables.
