Panasonic KX-NS700 Feature Manual page 307

Leading No.
[Explanation]
Calls are routed to the IP address of each V-IPGW card based on the leading number dialed.
Gateway Groups
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]
Gateway Settings List
1. IP Gateway(1): GW Group-1
2. IP Gateway(2): GW Group-1
3. IP Gateway(3): GW Group-2
4. IP Gateway(4): GW Group-2
When "123XXX" is dialed, the call is routed to GW Group-1. However the lowest-numbered device (IP
Gateway(1)) is busy or not available, so the call is rerouted to IP Gateway(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.
Document Version 2017-06
15.1.24 Private Network Features—VoIP (Voice over Internet Protocol)
2
3
:
Leading Number
List
1. 1xx: GW Group-1
2. 2xx: GW Group-2
PBX
V-IPGW
Destination
IP Address
200.45.11.35
199.176.64.1
Dials "123XXX"
Rerouted
Private IP
Network
:
Office A (GW Group-1)
IP Gateway(1)
Busy
IP Gateway(2)
Office B (GW Group-2)
IP Gateway(3)
IP Gateway(4)
Feature Manual 307