[This is pre-release documentation and subject to change in future releases. This topic's current status is: Milestone-Ready]

Topic Last Modified: 2010-07-18

This section assumes that you have already done the following:
  • published and configured either at least one or more Mediation Servers (as described in Define a Mediation Server for a Site and Publishing a Topology or in Defining a Front End Pool and Publishing a Topology, respectively)

  • defined at least one gateway peer to provide PSTN connectivity (as described in Define a Gateway Peer for a Site)

    If the peer you connect to is the SBC of a SIP trunking provider, ensure that the provider is a qualified provider and that the provider supports media bypass. For example, many SIP trunking providers will only allow their SBC to receive traffic from the Mediation Server. If so, then bypass must not be enabled for the trunk in question. Also, you cannot enable media bypass unless your organization reveals its internal network IP addresses to the SIP trunking provider.
If you have already optionally configured call admission control, another advanced Enterprise Voice feature, note that the bandwidth reservation performed by call admission control does not apply to any calls for which media bypass is employed. The two features are mutually exclusive for any particular call that is routed to the PSTN because media bypass assumes that bandwidth constraints do not exist between the endpoints on a call. Media bypass cannot be performed on links with restricted bandwidth. As a result, one of the following will apply to a PSTN call:
  • Media bypasses the Mediation Server, and call admission control does not reserve bandwidth for the call.

  • Call admission control applies bandwidth reservation to the call, and media is processed by the Mediation Server involved in the call.

This section describes how to enable media bypass to reduce the processing required of the Mediation Server. Before you enable media bypass, ensure that your environment meets the conditions required to support media bypass, as described in “Media Bypass” in the Enterprise Voice planning documentation. Also ensure that you used the information in “Media Bypass” to decide whether to enable media bypass global settings to always bypass the Mediation Server or to to use site and region information when determining whether to bypass the Mediation Server.

Next Steps: Enable Media Bypass on the Trunk Connection

After configuring initial settings for PSTN connectivity (dial plans, voice policies, PSTN usage records, outbound call routes, and translation rules), begin the process of enabling media bypass by using the steps in the “To configure media bypass on a trunk” procedure in “Configure Media Bypass on a Trunk”.

See Also