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Configuring Call Routing
Call routing algorithms
APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide Preliminary May 9, 2000 19-11
How the system finds a route
After sorting the call-routing database, the TAOS unit compares the information it has gathered
about a call to the values in the database, looking for a match. Values are compared in the
sorted order.
After each comparison, profiles that do not contain zero or a matching value in that compared
field are dropped from consideration, so after each pass the list is narrowed considerably. The
TAOS unit routes the call to the best match, which is the device that matches the greatest
number of components without the use of zero fields. If more than one device matches the
call’s parameters equally, the system routes the call to the first matching entry.
For example, Figure 19-2 shows three database entries for a modem card in slot 6, all of which
were created by Call-Route profiles.
Figure 19-2. Matching call information to a database entry
In the first entry, the preferred source is set to the first T1 line in slot 1, and the dial number is
2345. This entry passes the trunk group and subaddress comparisons, because both fields
specify 0. It fails on the telephone number comparison and is dropped from the list.
The second entry sets the preferred source to any channel on the third T1 line in slot 1. It
specifies trunk group 7 and dial number 1234. This entry passes the trunk group and
subaddress comparisons, because the trunk group matches and the subaddress is 0. It fails on
the telephone number comparison and is dropped from the list.
The third entry sets the preferred source to channel 10 on the third T1 line in slot 1. It specifies
trunk group 7 and dial number 1212. This entry matches the call information, so the call is
routed to the third modem in slot 6.
Note: If the list of remaining devices becomes empty at any point, the TAOS unit drops the
call. Depending on the type of call, the signaling being used, and the configuration of the
central office (CO) switch, dropping the call might result in the switch returning a busy
indication to the caller. If the caller receives a busy indication on a voice line, the indication
originates from the central office switch equipment, not from the TAOS unit.
Information gathered
from call:
Trunk group 7
Dial number 1212
Line 3 channel 10
voice-service
device # source type tg sa phone
1:10:01/0 0 1:01:01/0 voice-call-type 4 0 2345
1:10:02/0 0 1:01:03/0 voice-call-type 7 0 1234
1:10:03/0 0 1:01:03/10 voice-call-type 7 0 1212
LAN or
WAN
Host device
Network device:
PSTN