Sizing of media processing resources

Last Updated : Nov 05, 2012 |

For simplicity, the following default assumptions regarding media-processing usage is applied throughout this section:

  • SIP–SIP two-party calls always use SIP direct media (that is, no media-processing resources are required)

  • SIP–H.323 and H.323–H.323 two-party calls always shuffle (that is, one media-processing channel is required for the first 20 s of the call for each party)

  • SIP–TDM and H.323–TDM two-party calls always require one media-processing channel on the gateway to which the TDM endpoint is administered for the entire call duration

  • Intergateway TDM–TDM calls always require one media-processing channel on each gateway involved in the call for the entire call duration

  • Intragateway TDM–TDM calls require no media-processing resources

  • Multiparty (that is, 3-party or greater) calls cannot shuffle and, therefore, require media resources regardless of the types of endpoints involved. Call recorders and service-observing devices count as parties.

A system’s media-processing resources can reside on any port network or branch gateway, and the rules for sizing those resources are contained in subsequent topics.