[Example]
PBX-1
V-IPGW
Private IP
Network
PBX-2
V-IPGW(1)
V-IPGW(2)
PBX-3
V-IPGW(3)
V-IPGW(4)
Gateway Settings List
1. V-IPGW(1): GW Group-1
2. V-IPGW(2): GW Group-1
3. V-IPGW(3): GW Group-2
4. V-IPGW(4): GW Group-2
Office A (GW Group-1)
Dials "123XXX"
Office B (GW Group-2)
Busy
Rerouted
Leading Number
List
1. 1xx: GW Group-1
2. 2xx: GW Group-2
When "123XXX" is dialed, the call is routed to GW Group-1. However the lowest-numbered device
(V-IPGW(1)) is busy or not available, so the call is rerouted to V
-IPGW(2).
Common Extension Numbering for Multiple PBXs
Multiple PBXs in separate locations, connected in an IP network, can share a common block of extensions
designated in a gateway group.
Extn. 203
Extn. 202
Extn. 102
Extn. 303
Extn. 201
Extn. 105
Extn. 104
Extn. 103
Extn. 101
PBX B in Office B
1) Extn. 105 dialed
PBX C in Office C
2) Extn. 105 not
found in PBX B
3) Rerouted
4) Check next PBX in
Gateway Group settings
5) Extn. 105
found in PBX C
PBX A in Office A
V-IPGW
V-IPGW
V-IPGW
Private IP
Network
Explanation:
In the same way as when connected by a TIE Line, if a dialed number is not found at the local PBX, the call
can be sent to other PBXs connected via an IP network. When an extension number is dialed, the PBX first
searches local extensions for a matching number. If there is no match, the PBX then checks the TIE Line
Document Version 2016-03 Feature Manual 319
15.1.23 Private Network Features—VoIP (Voice over Internet Protocol)
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