Feature Manual References3.1.21 COS (Class of Service)9.1.2 ICD Group Features—Group Call Distribution10.1.1 LED Indication21.1 Capacity of System ResourcesOperating Manual References1.3.6 Call Hold1.3.49 PDN (Primary Directory Number)/SDN (Secondary Directory Number) Extension1.3.73 Walking COS13.1.8 Peer-to-Peer ConnectionDescriptionThis PBX automatically establishes peer-to-peer communication between peer-to-peer compatible IPextensions (i.e., IP-PTs and SIP extensions). Non-peer-to-peer IP extension calls are routed through theDSP card. However, with peer-to-peer calls, the call is routed directly from one IP extension to another withoutgoing through a DSP card. In other words, peer-to-peer calls can be made without using the PBX’s resources.Conditions• Peer-to-peer calls can only be made between extensions connected to the PBX through the IPCMPR/IPCEMPR card.• The following IP telephones are peer-to-peer compatible for calls between each other:– KX-NT265 (version 2.00 or later)*1– KX-NT300 series– KX-NT400– SIP Extensions*1 For details about checking the version of the KX-NT265, refer to the Installation Manual.• Three codecs are used for peer-to-peer calls: G.722, G.711, and G.729A. The speech quality of the codecsvaries 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. Forexample, if the caller prefers G.711 while the called party prefers G.729A, the call will be established usingG.729A.• G.722 is only available for calls between KX-NT400/KX-NT300 series IP-PTs and some SIP extensionsthat support this codec during peer-to-peer communication.• Through system programming, it is possible to assign a specific type of codec to be used for each extension.• For SIP extensions, the priority of the codec that will be used can be specified on a SIP extension basis.• For non-peer-to-peer calls via the DSP card, calls cannot be made or received when all of the card’sresources are being used.PC Programming Manual References3.15 [1-1] Slot—Port Property - Virtual IP Extension—Option— IP Codec PriorityFeature Manual References9.1.15 IP-PT (IP Proprietary Telephone)218 Feature Manual Document Version 2009-1213.1.8 Peer-to-Peer Connection
