Installation guide

Outbound call routing 29-13
Chapter 29: Understanding Wave Call Routing
Wave Global Administrator Guide
Off-premise extensions allow you to route calls to extensions on other PBXs by dialing
extension numbers.
The above figure shows the path by which a call to an off-premise extension is sent through
Wave. After determining that the call is an internal one (based on the first digit collected), Wave
looks up the local extension numbers.
If the extension number is not configured on the local Wave Server, Wave checks the
off-premise extension table for the number. If the number exists in the table, the call is routed
(or blocked). If the number does not exist in the table, the call fails and the user hears a fast busy
tone.
Off-Premise extension table
The off-premise extension table contains the ranges of extensions that exist on other PBXs (the
range can include internal numbers). An outbound routing table is used to translate the number
dialed and route the call to the trunk that will send it to the appropriate off-premise phone (see
“Outbound routing tables” on page 29-6). In the outbound routing table you can translate the
extension number to the appropriate number that will ring the extension on the far end.
Destination access code/direct to trunk group
Use destination access code/direct to trunk group routing to connect to another PBX that will
handle dialing restriction and digit translation. Destination access codes restrict calls per user,
not per call type, and do not allow you to do any digit translation, blocking, or alternate routing
based on the dialed number. All callers using a particular access code use the same trunk group
and are allowed to dial any number on the PSTN.
It is very important that you set the digit collection rules for each destination access code
properly in the First Digit Table (see “Creating destination access codes” on page 9-26).
Collecting too many or too few digits will cause calls using the access codes to fail. Using the
call numbering plan (North American Numbering Plan by default) can help you avoid problems
with calls bound for the PSTN.
Release 2.0
September 2010