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: