Panasonic KX-NS1000 User Manual page 452

5.2.3 Peer-to-Peer (P2P) Connection
P2P connection between branch offices over a VPN (mesh connection)
Site 1
PBX
Calls between IP telephones in separate branch offices establish a P2P connection directly through the VPN
routers at each branch.
P2P connection between sites with multiple PBXs
Site 1
PBX
Calls between telephones in separate sites, each with its own PBX, establish a P2P connection over a VPN.
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.
•
Through system programming, it is possible to assign the preferred codec to use for IP-PTs and KX-UT
series SIP phones.
•
For non-KX-UT series SIP extensions, the priority of the codec that will be used can be specified via the
telephone itself.
•
For non-peer-to-peer calls via the DSP card, calls cannot be made or received when all of the card's
resources are being used.
452 Feature Guide
Router
P2P
Router
Router
Remote Office 1
Router
P2P
Remote Office 2
Router
Site 2
PBX