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For General SIP and P-SIP 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.
•
General SIP phones support P2P communication over SIP trunks.
•
KX-NT500 series IP-PTs support P2P communication over SIP trunks. For information about the required
software version for KX-NT500 IP-PTs, consult your dealer. Other IP-PTs do not support this feature.
•
IP-CSs do not support P2P connections.
•
This PBX supports H.263/H.264 codecs for P2P video communication.
•
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.
•
A P2P connection cannot be made between an IP extension and SIP trunk 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
"5.5.3 DSP Resource Usage". Also, video connections are not possible.
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If all of the following conditions are met, it will be possible to continue a P2P call at time of a PBX failure.
–
The terminal performing the P2P call is a KX-NT550 series terminal
–
The terminal performing the P2P call is not integrated in the Expansion Gateway
[P2P Groups]
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Telephones or SIP Trunks must belong to the same P2P group to establish a P2P connection.
Telephones or SIP Trunks at different sites 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.
•
Each PBX in a Multi-Connection 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
•
Calls between extensions or SIP Trunks in different P2P groups will consume DSP resources, even if
both extensions or SIP Trunks belong to the same PBX (site).
•
To activate P2P communication between IP extensions and IP trunks, set IP Extension - SIP Trunk P2P
to enable.
•
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.
PBX
DSP
Router
5.2.3 Peer-to-Peer (P2P) Connection
Site 2
PBX
Router
Feature Manual
399
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