Panasonic KX-NS1000 Feature Manual page 266

15.1.5 Peer-to-Peer (P2P) Connection
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KX-NT500 series IP-PTs support P2P communication over SIP CO lines. For information about the
required software version for KX-NT500 IP-PTs, consult your dealer. Other IP-PTs do not support this
feature.
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IP-CSs do not support P2P connections.
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This PBX supports H.263/H.264 codecs for P2P video communication.
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P2P communication using the T.38 protocol is supported for calls between IP extensions or IP extensions
and IP CO lines. However, only SIP extensions and SIP CO lines can be used.
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A P2P connection cannot be made between an IP extension and SIP CO line if they are connected to
different sites.
In this case, the DSP resources of the PBX will be used to make the connection. For details, see
"5.1.18 DSP Resource Usage". Also, video connections are not possible.
[P2P Groups]
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Telephones or SIP CO lines must belong to the same P2P group to establish a P2P connection. Telephones
or SIP CO lines at different sites can be assigned to the same P2P group.
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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.
If a call is made between sites in a One-look network, 1 DSP resource is required at each PBX.
(® 5.1.18 DSP Resource Usage)
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Each PBX in a One-look network is also assigned to a P2P group. This assignment is used when a non-IP
telephone (e.g., an SLT) is on a call with an IP telephone at another branch. If the PBX and the IP telephone
both belong to the same P2P group, the connection is established from the PBX to the IP telephone directly.
Site 1
P2P Group 1
SLT
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Calls between extensions or SIP CO lines in different P2P groups will consume DSP resources, even if
both extensions or SIP CO lines belong to the same PBX (site).
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To activate P2P communication between IP extensions and IP CO lines, set IP Extension - SIP Trunk
P2P to enable.
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The PBX configures P2P group settings for each SIP CO line port, and P2P communication is only allowed
when both parties belong to the same P2P group.
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In an environment where P2P communication between IP extensions and IP CO lines is not allowed due
to provider restrictions, set IP Extension - SIP Trunk P2P to disable, or assign different P2P group settings
between callers.
Note
During P2P communication, DTMF signals cannot be detected by the PBX since sound RTP packets are
processed directly between IP extensions and IP CO lines. As a result, features that use DTMF detection
(e.g., DISA Call Transfer to Outside User) cannot be used. To use such features, change the settings to
allow for non-P2P calls, to create an environment where DTMF detection is available. Confirm with your
ITSP whether there are services which use DTMF detection and whether P2P communication is possible.
266 Feature Manual
PBX
DSP
Router
Site 2
PBX
Router
Document Version 2016-03