SIP Transport Selection Configuration

You enable this feature per SIP interface by setting options that control the maximum UDP length and allow UDP fallback:

• max-udp-length=X (where X is the maximum length)—Sets the largest UDP packers that the Oracle® Enterprise Session Border Controller will pass. Packets exceeding this length trigger the establishment of an outgoing TCP session to deliver the packet; this margin is defined in RFC 3261. The system default for the maximum UDP packet length is 1500.

  You can set the global SIP configuration’s max-udp-length=X option for global use in your SIP configuration, or you can override it on a per-interface basis by configuring this option in a SIP interface configuration.

• udp-fallback—When a request needs to be sent out on the SIP interface for which you have configured this option, the Oracle® Enterprise Session Border Controller first tries to send it over TCP. If the SIP endpoint does not support TCP, however, then the Oracle® Enterprise Session Border Controller falls back to UDP and tries the request again.

  To enable SIP Transport Selection:

1. In Superuser mode, type configure terminal and press Enter.

   ORACLE# configure terminal

2. Type session-router and press Enter to access the session-router path.

   ORACLE(configure)# session-router

3. Type sip-interface and press Enter. The system prompt changes to let you know that you can begin configuring individual parameters.

   ORACLE(session-router)# sip-interface

4. options—Set the options parameter by typing options, a Space, the option name max-udp-length=X (where X is the maximum UDP length you want to set), and then press Enter.

   ORACLE(sip-interface)# options +max-udp-length=900

   If you type options max-udp-length=X, you will overwrite any previously configured options. In order to append the new option to the sip-interface’s options list, you must prepend the new option with a plus sign as shown in the previous example.

5. options—Set the options parameter by typing options, a Space, the option name udp-fallback, and then press Enter.

   ORACLE(sip-interface)# options +udp-fallback

   If you type options udp-fallback, you will overwrite any previously configured options. In order to append the new option to the sip-interface’s options list, you must prepend the new option with a plus sign as shown in the previous example.

6. Save and activate your configuration.