Keep-alive Configuration

You use the register-keep-alive attribute, available in SIP Interface configuration mode, to enable CR/LF keep-alive on a SIP interface.

1. In Superuser mode, use the following ACLI command sequence to access SIP Interface configuration mode.

   ORACLE# configure terminal
   ORACLE(configure)# session-router
   ORACLE(session-router)# sip-interface
   ORACLE(sip-interface)#

2. The register-keep-alive attribute enables CR/LF keep-alive on the current SIP interface.

   none — (the default) disables CR/LF keep-alive

   always — assuming that the endpoint has included the keep parameter in the Via header, exchange CR/LF keep-alives with that endpoint

   bnat — assuming that the endpoint has included the keep parameter in the Via header, exchange CR/LF keep-alives only with endpoints that are behind an intervening NAT device (based on comparing source IP packet addresses with IP addresses extracted from the SIP request).

   ORACLE(sip-interface)# register-keep-alive always

   ORACLE(sip-interface)#

3. If CR/LF keep-alive is enabled on the current SIP interface (register-keep-alive is always or hint), use the tcp-nat-interval attribute to specify the value of the keep parameter provided by the SBC to the SIP endpoint.

   In the absence of an explicit assignment, this attribute defaults to a value of 30 seconds.

   The SIP endpoint transmits periodic CR/LF Ping so that the interval between each request is randomly distributed between 80 and 100 percent of the value of the tcp-nat-interval attribute.

   Assuming the default value (30 seconds) the interval between CR/LF binding requests would vary from 24 to 30 seconds.

   ORACLE(sip-interface)# nat-interval 20

   ORACLE(sip-interface)#

4. Use done, exit, and verify-config to complete this configuration.
5. Save and activate your configuration.