Cisco WRP400-G1 Administration Guide - Page 15

Product Overview and Deployment Guidelines Special Requirements for Voice Deployments 1 The available connection bandwidth determines the maximum number of simultaneous calls that the system can support with the appropriate audio quality. Use this information to determine the maximum number of simultaneous VoIP connections that the system can support. For asymmetric connections, such as ADSL, the maximum number of calls is determined by the upstream bandwidth. In general it is a good practice to use no more than 75% of the total available bandwidth for calls. This provides space for data traffic and helps ensure good voice quality. NOTE Some ITSP SIP trunk services limit the maximum number of simultaneous calls. Please check with your Service Provider to understand the maximum number of simultaneous calls each SIP trunk supports. The following table provides the approximate bandwidth budget for different codecs. Codec G.711 G.72640 G.72632 G.72624 G.72616 G.729 Approximate bandwidth budget for each side of conversation 110 kbps 87 kbps 79 kbps 71 kbps 63 kbps 55 kbps 2 calls 220 kbps 174 kbps 158 kbps 142 kbps 126 kbps 110 kbps 4 calls 440 kbps 348 kbps 316 kbps 284 kbps 252 kbps 220 kbps 6 calls 660 kbps 522 kbps 474 kbps 426 kbps 378 kbps 330 kbps 8 calls 880 kbps 696 kbps 632 kbps 568 kbps 504 kbps 440 kbps For more information about bandwidth calculation, refer to the following web sites: www.erlang.com/calculator/lipb/ www.bandcalc.com/ Cisco Small Business WRP400 Administration Guide 13