1. KX-TDE and KX-NCP DSP Impact, August 2010, V1.0 EVERY CALL MATTERS KX-TDE and KX-NCP Series OneNet

2. EVERY CALL MATTERS KX-TDE and KX-NCP DSP Impact, August 2010, V1.0 TDM-VoIP channel capacity Increases from current 49 channels to 113 channels* VoIP and IP Capacity Enhancements *New MPR Hardware required (Mass production changes from July 2010) TDM Option Cards LCOT / DHLC BRI / PRI / DLC / SLC IP Trunk: SIP /H.323 Ext: IP-PT/SIP 49 113

3. EVERY CALL MATTERS KX-TDE and KX-NCP DSP Impact, August 2010, V1.0 VoIP and IP Capacity Enhancements TDM Option Cards LCOT / DHLC BRI / PRI / DLC / SLC IP Trunk: SIP /H.323 Ext: IP-PT/SIP 49 113 DSP TrunksExtensions DPT SLT ISDN PS (DECT) PSTN TrunksExtensions SIP H.323 IP-PT HGT100 IP-CS

4. EVERY CALL MATTERS KX-TDE and KX-NCP DSP Impact, August 2010, V1.0 SYSTEM ENHANCEMENT IMPACT ON DSP KX-TDE100/200/600 and KX-NCP500/1000 OneNet

5. EVERY CALL MATTERS KX-TDE and KX-NCP DSP Impact, August 2010, V1.0 PlatformVersionIP CS SupportIP Extensions On IPCMPR Card Total IP Trunks On IPCMPR Card DSP Impact due to Version Up TDE600 V2No6432 Yes V3Yes12864 1 TDE100/200 TDE600 NCP500/1000 OneNet (V4)Yes12864 2 Yes System Capacity Enhancements Notes: 1.64 IP trunks mean – Max 32 SIP trunks and Max 32 H.323 trunks at the same time. 2.64 IP Trunks mean – Max 64 SIP Trunks, but only a Max 32 H.323 Trunks. Total 64 IP trunks at any time As System Capacity for the TDE100/200 /600 and NCP500/1000 communication platform improves, the DSP implications need to be well understood.

6. EVERY CALL MATTERS KX-TDE and KX-NCP DSP Impact, August 2010, V1.0 Calls between TDM and SIP Trunks DSP Impact due to improved MPR Hardware – 64 SIP trunks and 32 H.323 trunks (Total remains 64 Channels) SIP Trunk CODEC DSP4 1 DSP16 1 DSP64 G.7115 Calls32 calls64 calls G.7292 Calls12 calls50 calls 2 Note: 1.No improvement for DSP4/16 because DSP limit has been reached 2.Limitation by DSP64, G.729 requires more DSP resource than G.711. TDM Option Cards LCOT / DHLC BRI / PRI / DLC / SLC IP Trunk: SIP /H.323 Ext: IP-PT/SIP 49 113 DSP Extensions DPT PS (DECT) SLT Extensions 64 SIP Trunks 32 H323 Trunks

7. EVERY CALL MATTERS KX-TDE and KX-NCP DSP Impact, August 2010, V1.0 Calls between IP PT and TDM DSP Impact due to improved MPR hardware – Calls between IP-PT and ISDN/Analogue CO/DPT/SLT/PS Note: 1.Limit reached due to 113 Channel limit 2.No improvement for DSP4 because not enough DSP capacity. IP-PT CODECDSP4 2 DSP16DSP64 G.71116 Calls64 calls113 calls 1 G.7294 Calls16 calls64 calls Limited by DSP64 G.729 requires more DSP than G.711. DSP16 supports 16 IP-PT for G.729. DSP64 supports 64 IP-PT for G.729. DSP16/64 supports more for G.711. TDM Option Cards LCOT / DHLC BRI / PRI / DLC / SLC IP Trunk: SIP /H.323 Ext: IP-PT/SIP 49 113 DSP TrunksExtensions DPT SLT ISDN PS (DECT) PSTN IP-PT (Max. 128)

8. EVERY CALL MATTERS KX-TDE and KX-NCP DSP Impact, August 2010, V1.0 IP-PT to SIP Trunk Communication SIP Trunk CODECIP-PT CODECDSP4DSP16DSP64 G.711 8 Calls32 calls64 calls G.729 2 Calls8 calls32 calls G.711G.729 2 Calls12 calls42 calls G.729G.711 Both SIP trunk and IP-PT use DSP. No improvement for DSP4/16 because not enough DSP capacity. TDM Option Cards LCOT / DHLC BRI / PRI / DLC / SLC IP Trunk: SIP /H.323 Ext: IP-PT/SIP 49 113 64 SIP Trunks DSP IP-PT (Max. 128)

9. EVERY CALL MATTERS KX-TDE and KX-NCP DSP Impact, August 2010, V1.0 IP-CS CODEC DSP4DSP16DSP64 G.71116 Calls64 calls 1 113 Calls 2 G.7294 Calls16 calls64 Calls Calls between IP CS and DPT DSP Impact due to IP CS – Calls between IP-CS and ISDN/Analogue CO/DPT/SLT/PS (via Normal CS) Note: 1.Limit of DSP16 2.Limit reached due to 113 Channel limit No improvement for DSP4 because not enough DSP capacity. Limited by DSP64 G.729 requires more DSP than G.711. DSP16 supports 16 IP-PT for G.729. DSP64 supports 64 IP-PT for G.729. DSP16/64 supports more for G.711. TDM Option Cards LCOT / DHLC BRI / PRI / DLC / SLC IP Trunk: SIP /H.323 Ext: IP-PT/SIP 49 113 DSP TrunksExtensions DPT SLT ISDN PS (DECT) PSTN IP-CS (Max. 16)

10. EVERY CALL MATTERS KX-TDE and KX-NCP DSP Impact, August 2010, V1.0 IP-CS to SIP Trunk Communication Note: 1.Limit reached due to DSP16 resources. 2.IP-CS connection does not support P2P connection. Therefore, IP-CS takes one TDM-IP Channel and IP-Trunk also takes one TDM-IP Channel – for one call. One IP-CS to IP-Trunk thus takes two TDM-IP Channels. Maximum no. TDM- IP Channels is thus 113/2=56.5 => 56 SIP Trunk CODECIP-CS CODECDSP16DSP64 G.711 21 calls56 calls 2 G.711G.72910 calls56 calls 2 G.729 6 calls 1 56 calls 2 TDM Option Cards LCOT / DHLC BRI / PRI / DLC / SLC IP Trunk: SIP /H.323 Ext: IP-PT/SIP 49 113 64 SIP Trunks DSP IP-CS (Max. 16)