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popid_1526712186="<p>Before an analogue voice signal can be transmitted through a digital medium, it must be converted to a digital form. This sampling and quantisation function is performed by a CODEC, which follows the rules defined by a compression scheme. CODECs vary in terms of the voice quality, delay and bandwidth characteristics.<\/p>\n\r<p>&nbsp;<\/p>\n\r<p>The available CODECs within VoIP Lite are:<\/p>\n\r<p>&nbsp;<\/p>\n\r<p>G.711<\/p>\n\r<p>G.723.1<\/p>\n\r<p>G.726<\/p>\n\r<p>G.728<\/p>\n\r<p>G.729A<\/p>\n\r"
popid_918343927X="<p>Packet Interval or packet duration describes how often a packet (or datagram) is sent through the network.&nbsp; This has a very direct bearing on bandwidth requirements and voice quality.&nbsp; If packets are sent very frequently, then the bandwidth requirements will increase because of the extra overhead of the IP, UDP and RTP packet headers.<\/p>\n\r<p>&nbsp;<\/p>\n\r<p>If packets are sent less frequently, then the overall delay of the system will increase due to the required buffering.&nbsp; The system will also become more susceptible to individual packet loss.<\/p>\n\r<p>&nbsp;<\/p>\n\r<p>20ms is considered to be a reasonable interval for IP packet transmission.<\/p>\n\r"
popid_1629288505="<p>When transmitted through an IP-based network, the IP\/UDP\/RTP headers can add a significant bandwidth overhead. This can be reduced using header compression (known by Cisco as cRTP).<\/p>\n\r<p>&nbsp;<\/p>\n\r<p>VoIP Lite supports header compression to both 2 and 4 octets.<\/p>\n\r"
popid_1557022859="<p>The number of voice paths required to be transmitted through an IP network.<\/p>\n\r"
popid_1284046027X="<p>The bandwidth available through an IP based network.&nbsp; The units used can be either kbps or Mbps depending on which option is selected using the radio buttons on the right side of the window.<\/p>\n\r"
popid_792918666="<p>Busy hour traffic is the amount of traffic offered to a trunk group during the busiest hour of a day. CCITT E.500 makes a more detailed definition of busy hour but this is beyond the scope of this user guide. Busy hour traffic is used as the basis for calculations using the Erlang B traffic model.<\/p>\n\r<p>If you are working out the number of lines required for a trunk group, you must know this figure, or make a reasonable estimate. The unit for busy hour traffic is the Erlang. 1 Erlang represent the continuous use of one circuit for one hour. So, if during the busy hour, 60 calls are made, each lasting one minute, the busy hour traffic figure is 1 Erlang. (Theorists will argue that the Erlang unit is dimensionless, and strictly speaking, this is true).<\/p>\n\r<p>&nbsp;<\/p>\n\r<p>In the USA, the unit commonly used for traffic measurement is the CCS (Centi-call second). The following conversion factor can be applied between the two units:<\/p>\n\r<p>&nbsp;<\/p>\n\r<div style=\"text-align: left; text-indent: 0px; padding: 0px 0px 0px 0px; margin: 0px 0px 0px 0px;\"><table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" style=\"line-height: normal;\"><tr style=\"vertical-align:baseline\" valign=\"baseline\"><td width=\"13\"><span style=\"font-size: 8pt; font-family: \'Arial Unicode MS\', \'Lucida Sans Unicode\', \'Arial\'; color: #000000;\">&#8226;<\/span><\/td><td>1 Erlang = 36 CCS<\/td><\/tr><\/table><\/div><div style=\"text-align: left; text-indent: 0px; padding: 0px 0px 0px 0px; margin: 0px 0px 0px 0px;\"><table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" style=\"line-height: normal;\"><tr style=\"vertical-align:baseline\" valign=\"baseline\"><td width=\"13\"><span style=\"font-size: 8pt; font-family: \'Arial Unicode MS\', \'Lucida Sans Unicode\', \'Arial\'; color: #000000;\">&#8226;<\/span><\/td><td>1 CCS = 0.0278 Erlangs<\/td><\/tr><\/table><\/div><p>&nbsp;<\/p>\n\r<p>You can select which unit is used to enter and display the busy hour traffic figure by selecting its associated radio button on the right side of the application window.<\/p>\n\r"
popid_1468899807X="<p>Blocking is a fraction representing the calls which cannot be completed because all lines are busy. 0.1 means that 10% of calls are blocked. 0.01 means that 1% of calls are blocked. Depending upon the application, reasonable figures for blocking are between 0.01 and 0.03. Callers experiencing blocking will usually hear a busy signal.<\/p>\n\r"