Panasonic KX-NS700 Feature Manual page 258

15.1.6 Peer-to-Peer (P2P) Connection
P2P connection between an IP extension and IP CO line within a site
Voice packets are transmitted and received between the IP extension and the IP CO line within a site.
P2P connection between branch offices over a VPN (hub-and-spoke connection)
Site
PBX
Calls between IP telephones in separate branch offices establish a P2P connection, using the hub router at
Site to communicate over a VPN.
When the VPN uses a hub-and-spoke (star) topology, the hub router must be configured to allow U-turn connections.
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P2P connection between branch offices over a VPN (mesh connection)
Site
PBX
Calls between IP telephones in separate branch offices establish a P2P connection directly through the VPN
routers at each branch.
Conditions
[General]
•
Three codecs are used for peer-to-peer calls: G.722, G.711, and G.729A. The speech quality of the
codecs varies as follows: (High) G.722, G.711, G.729A (Low).
When the preferred codec of each party differs, the call will be established using the lower codec. For
example, if the caller prefers G.711 while the called party prefers G.729A, the call will be established
using G.729A.
•
G.722 is only available for calls between KX-NT300 series IP-PTs, KX-NT500 series IP-PTs, and some
SIP extensions that support this codec during peer-to-peer communication.
•
For non-KX-UT series SIP extensions, the priority of the codec that will be used can be specified via the
telephone itself.
258 Feature Manual
P2P
Hub router
Router
Remote Office 1
Router
Remote Office 2
Router
Remote Office 1
Router
P2P
Remote Office 2
Router
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Document Version 2017-06