Panasonic KX-NS700 Feature Manual page 500

5.2.3 Peer-to-Peer (P2P) Connection
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.
•
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.
•
KX-UT series SIP phones and general SIP phones support P2P communication over SIP trunks.
•
KX-NT500 series IP-PTs support P2P communication over SIP trunks. Contact your dealer for the
compatible software version for each KX-NT500 series IP-PT. Other IP-PTs do not support this feature.
•
IP-CSs do not support P2P connections.
•
P2P communication using the T.38 protocol is supported for calls between IP extensions or IP extensions
and IP trunks. However, only SIP extensions and SIP trunks can be used.
[P2P Groups]
•
Telephones or SIP Trunks must belong to the same P2P group to establish a P2P connection. Telephones
or SIP Trunks can be assigned to the same P2P group.
•
Calls between IP extensions in different P2P groups are established via the DSP card in "DSP-through
mode". DSP-through mode is where only 1 DSP resource is required, regardless of the codec being used.
•
Calls between extensions or SIP Trunks in different P2P groups will consume DSP resources.
•
To activate P2P communication between IP extensions and IP trunks, set IP Extension - SIP Trunk
P2P to enable (® 10.9 PBX Configuration—[2-9] System—System Options—Option 8—
Trunk P2P—IP Extension - SIP Trunk P2P).
•
The PBX configures P2P group settings for each SIP trunk port, and P2P communication is only allowed
when both parties belong to the same P2P group.
500 Feature Manual
Router
Remote Office 1
Router
P2P
Remote Office 2
Router
Extension -