Panasonic KX-NS1000 - 5.3 Legacy Device Connection; 5.3.1 Stacking Connection

[Example]
PBX PBX
Router
Site 1
IP-PT KX-UT
Series
Router
Site 2
IP-PT KX-UT
Series
Internet
SIP server
SIP
SIP Signal
Voice Packet
P2P connection between an IP extension and IP trunk within a site
Voice packets are transmitted and received between the IP extension and the IP trunk within a site.
Notice
When you
install SIP trunks on a KX-NS1000 that is using the built-in router function, the SIP trunks must
be registered to the KX-NS1000 that contains the built-in router.
P2P connection between branch offices over a VPN (hub-and-spoke connection)
*1
Remote Office 1
Remote Office 2
Router
Site 1
PBX
Router
Hub router
P2P
Calls between IP telephones in separate branch offices establish a P2P connection, using the hub router at
Site 1 to communicate over a VPN.
*1
When the VPN uses a hub-and-spoke (star) topology, the hub router must be configured to allow U-turn connections.
468 Feature Guide
5.2.3 Peer-to-Peer (P2P) Connection