Panasonic KX-NSX2000 - Gateway Groups; Common Extension Numbering for Multiple Pbxs

4.3.2.1 Gateway Groups
Description
It is possible to automatically reroute outgoing VoIP calls according to preassigned gateway groups.
A gateway device can be assigned a gateway group number based on its IP Address. When a call is made
using a leading number allocated to a gateway group, it is routed to the lowest-numbered available device
within that group. In other words, if the lowest-numbered device is busy or not available, the call slides to the
next available device.
[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 dialled, 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).
4.3.2.2 Common Extension Numbering for Multiple PBXs
Description
Multiple PBXs in separate locations, connected in an IP network, can share a common block of extensions
designated in a gateway group.
4.3.2 Voice over Internet Protocol (VoIP) Network
366 Feature Manual