Panasonic KX-NS700 Feature Manual page 259

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For SIP extensions, the priority of the codec that will be used can be specified on a SIP extension basis.
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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.
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KX-UT series SIP phones and general SIP phones support P2P communication over SIP CO lines.
•
KX-NT500 series IP-PTs support P2P communication over SIP CO lines. For KX-NT500 series IP-PTs,
use the latest firmware. Other IP-PTs do not support this feature.
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IP-CSs do not support P2P connections.
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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.
[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 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.
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Calls between extensions or SIP CO lines in different P2P groups will consume DSP resources.
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To activate P2P communication between IP extensions and IP CO lines, set IP Extension - SIP Trunk
P2P to enable. (→ 10.9 PBX Configuration—[2-9] System—System Options—Option 8—Extension -
Trunk P2P—IP Extension - SIP Trunk P2P).
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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.
•
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.
Installation Manual References
4.3.3 DSP Cards
PC Programming Manual References
9.2.2 PBX Configuration—[1-1] Configuration—Slot—System Property—Site—VoIP-DSP Options
9.10 PBX Configuration—[1-1] Configuration—Slot—Port Property—V-SIPGW—Main—P2P Group
9.10 PBX Configuration—[1-1] Configuration—Slot—Port Property—V-SIPGW—Main—P2P Group Name
9.14 PBX Configuration—[1-1] Configuration—Slot—Port Property—V-IPEXT—Remote Place (Location /
P2P)—P2P Group
9.14 PBX Configuration—[1-1] Configuration—Slot—Port Property—V-IPEXT—Remote Place (Location /
P2P)—P2P Group Name
9.14 PBX Configuration—[1-1] Configuration—Slot—Port Property—V-IPEXT—Option—IP Codec Priority
9.16 PBX Configuration—[1-1] Configuration—Slot—Port Property—V-SIPEXT—Main—P2P Group
9.16 PBX Configuration—[1-1] Configuration—Slot—Port Property—V-SIPEXT—Main—P2P Group Name
9.16 PBX Configuration—[1-1] Configuration—Slot—Port Property—V-SIPEXT—FAX/T.38
9.20 PBX Configuration—[1-1] Configuration—Slot—Port Property—V-UTEXT—Main—P2P Group
Document Version 2017-06
15.1.6 Peer-to-Peer (P2P) Connection
Feature Manual 259