Panasonic KX-NCP500 Feature Manual page 284

13.1.26 Private Network Features—VoIP (Voice over Internet Protocol)
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.
1) Extn. 105 dialed
PBX A in Office A
Extn. 101
Extn. 103
Extn. 104
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
Routing Table for the Gateway Group for a corresponding entry. If an entry is found, the call is sent to the
connected PBX.
Automatic Rerouting of VoIP Calls to Public CO Lines
When a VoIP call cannot be completed successfully, the PBX can automatically attempt to make the call using
a public CO line instead. This provides a backup method of making calls in cases when IP network transmission
cannot be completed successfully.
[Example]
Telephone Company
(area code: 222)
PBX-1
Extn .1000
Dials
PBX code: 30
"7-20-1011".
The leading numbers of extensions accessed through the VoIP network are added as entries to the Quick
Dialing table, in addition to being registered as Other PBX Extension Numbers, as shown below:
[Programming Example]
Number to dial to call an extension at another PBX using VoIP network:
7 (TIE line access number) + 20 (PBX Code) + 1011 (extension number)
284 Feature Manual
V-IPGW
4) Check next PBX in
Gateway Group settings
1-333-123-1011
Private IP
IP-GW
Network
2) Extn. 105 not
found in PBX B
3) Rerouted
Private IP
Network
Telephone Company
(area code: 333)
PBX-2
IP-GW
PBX code: 20
PBX B in Office B
Extn. 102
V-IPGW
Extn. 202
Extn. 203
PBX C in Office C
Extn. 105
Extn. 201
V-IPGW
Extn. 303
5) Extn. 105
found in PBX C
Extn .1011
(333-123-1011)
Document Version 2013-05