Configuring Call Routing
Call routing algorithms
How the system finds a route
After sorting the
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
Figure 19-2. Matching call information to a database entry
Network device:
PSTN
LAN or
WAN
Host device 
Information gathered from call:
Trunk group 7 Dial number 1212 Line 3 channel 10
device | # | source | type | tg |
| sa phone |
1:10:01/0 0 | 1:01:01/0 | 4 | 0 | 2345 | ||
1:10:02/0 0 | 1:01:03/0 | 7 | 0 | 1234 | ||
1:10:03/0 0 | 1:01:03/10 | 7 | 0 | 1212 | ||
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.
APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide |
