Aastra OpenCom 131 User Guide - Page 162
Numbering, open numbering, a user must always dial this code digit and then the telephone
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PBX Networking Configuration In the above example, a route set up for PBX 1 allows a connection to PBX 2. Bundle "C," "E" and "A" are assigned to this route. If a user connected to PBX 1 wants to reach a party in PBX 2, lines will be seized in the following order: ■ PBX 1 first searches for a free channel in the "C" bundle. ■ If all the lines in bundle "C" are busy, the system tries to set up a connection via bundle "E". PBX 3 switches the connection through, provided it is appropriately configured (refer to Numbering starting on page 160). ■ If it was not possible to set up an indirect connection via PBX 3, the system tries again via bundle "A". The "prefix" necessary for this can be configured with the route. ■ The user does not get a busy signal until the attempt to set up an indirect connection via the network operator has also failed. Note: If an internal connection is switched via a network operator, the call is signalled using the external number of the calling PBX. For each route you can define a randomly selectable code digit for seizing the route. You can also configure whether a user is authorised to seize a particular route, whether LCR is to be used for one of the bundle and the criteria (business or private call, booking numbers) for evaluating call data. 12.3.3 Numbering A user can seize a particular route by pre-dialling a specific code digit. With this "open numbering", a user must always dial this code digit and then the telephone number in order to reach a party in another PBX. If none of the telephone numbers in your PBX network occur twice, you can also configure "closed numbering", allowing the same telephone number to be used for reaching each user within the PBX network. With closed numbering, the OpenCom 100 determines which route to seize from the telephone number dialled. The information needed for routing a call can be configured in a numbering table containing up to 100 entries. You use this table to assign telephone numbers and/or ranges of telephone numbers to a particular route. 160