Aastra OpenCom 510 User Guide - Page 161
default, Example of closed numbering tables
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PBX Networking Configuration A default entry in the numbering table makes it possible to seize a "default route" for all remaining unassigned numbers. In particular, this simplifies configuration of the OpenCom 510 as a subsidiary system: the only entry you assign to the default entry is the route to the host system PBX c 100-199 d b 4: b a D: c PBX e 200-299 f 3: e h 5: h g D: d PBX 300-399 k 5: k D: f PBX 400-499 D: a PBX i 500-599 3: i D: g D:Default Route Example of closed numbering tables The automatic switching of call requests (i.e. routing) by means of trunk group overflow or default numbering can lead to "circular switching". To avoid this, a "transit" counter is incremented whenever a connection is switched through on Q.SIG lines. When the configured maximum value is reached, further switching stops. 159