A-SBC/P-CSCF Requirements

The Access Session Border Controller (A-SBC) configuration must include the following:

• A public SIP interface the A-SBC can use for communication with the Transcoding Session Border Controller (T-SBC).
• A transcoding realm, which is a separate realm for the public SIP interface used only for communication with the T-SBC.
• Appropriate codec policies, including ones set up to add SDP on the egress leg of the session.
• A global SIP configuration, with transcoding-realm set to the name where valid transcoding agents reside, and a transcoding-agents list configured with one or any combination of
  • A DNS hostname for a single session agent that can resolve to one or more IP addresses
  • An IPv4 or IPv6 address with or without the port specified (when not specified, the system defaults to port 5060).
  • The name of a session agent group.