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| ##master-page:HomepageReadWritePageTemplate ##master-date:Unknown-Date #format wiki #language en = Cisco VoiP (Voice over IP) = == CCMX Notes == *[[http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a00801a62a8.shtml|Note:]] Voice monitoring and recording are supported only on IPCC Express Enhanced and Premium Edition, not on Standard Edition. * The VoIP silent monitoring server must be on the same VLAN as the agent phones and requires an available SPAN port. == Next == * Cisco BW calculations, and optimization. http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml#configvoice * Packet size, VAD * VoiP [[http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/4_1_2/ccmsys/a02sycfg.html#wp1038253|Bandwidth]] savings. 1. Codec: G.711 (64 Kbps) , G.729 ('''8 Kbps''' - Voice)('''24 Kbps''' - with serial overhead) ('''32kbps - on [[http://www.voip-info.org/wiki/view/Bandwidth+consumption|ethernet]]''') 1. Changing Voice Payload Sizes * G.729 call with voice payload size of 20 bytes (20 ms):= 24 Kbps 40 bytes (40 ms):= 16 Kbps * Note: L2 headers are not considered in this calculation. 1. RTP Header-Compression or Compressed RTP (cRTP) * Compressed Real-Time Protocol (cRTP) reduces the IP/UDP/RTP headers to 2or 4bytes (cRTP is not available over Ethernet). * [[http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/4_1_2/ccmsys/a02cac.html|Call Admission Control]] * Locations, for systems with centralized call processing. Bandwidth (kbps) * Regions define the type of compression (G.711, G.723, or G.729) that is used on the link, and locations define the amount of available bandwidth for the link. * You assign each device in the system to both a region (by means of a device pool) and a location. * Setup BRI at remote site for breakout using central callmanager, H.323 {{{ ! voice-card 0 dspfarm dsp services dspfarm ! voice call carrier capacity active voice rtp send-recv ! voice service voip h323 ! interface FastEthernet0/0.x description VOICE-Vlan ip address XX h323-gateway voip interface h323-gateway voip bind srcaddr XX ! interface BRI1/0 description ISDN-VoicePort no ip address isdn switch-type basic-net3 isdn point-to-point-setup isdn incoming-voice voice isdn send-alerting isdn sending-complete ! voice-port 1/0 compand-type a-law ! voice-port 1/1 compand-type a-law ! ! dial-peer voice 20 voip destination-pattern 01132699.. voice-class codec 1 session target ipv4:10.110.0.102 incoming called-number 01132699.. dtmf-relay h245-alphanumeric no vad ! dial-peer voice 3 pots destination-pattern .T progress_ind alert enable 8 incoming called-number 9... direct-inward-dial port 0/1 forward-digits all ! }}} ... ---- CategoryCisco |
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