[SIPForum-discussion] When will the System Generate the first OPTION Message

qcorba qcorba at gmail.com
Mon Dec 14 13:34:09 UTC 2015

OPTIONS may be used as periodic pings for keepalive or heartbeat. This
is usually out-of-dialog; i.e. not related to INVITE.

Please see:
1. SIPconnect 1.1 Technical Recommendation section 16.4.

2. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube_sipsip/configuration/xe-3s/asr1000/cube-sipsip-xe-3s-asr1000-book/voi-out-of-dialog.html

On 12/14/15, Vernal DSouza <vjd2112 at yahoo.com> wrote:
> Hello,
> OPTIONS can be sent to query the status of the UAS i.e. whether it is still
> IN-SERVICE to handle the traffic or not. So, when the INVITE is sent to that
> session-agent, if it does not respond then OPTIONS (if configured) are sent
> . OPTIONS are re-transmitted until trans-expire time is reached and then
> puts the session-agent in OOS state. My question is when are the OPTIONS
> message sent, I mean is there any timer or standard time after which the
> OPTIONS message is sent when the INVITE is not getting any response?
> If I rephrase it, When will the system (SBC) generate the first OPTION
> Message in this scenario?
> Regards,Jason

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