Hello,
OpenSIPS trunk has recently been enhanced and now allows the dialog
end-points to be pinged via SIP OPTIONS messages.
This feature can help detecting ghost calls, being an alternative to the
RTP timeout notification, when the server does not handle the media in
any way.
The create_dialog() function [1], provided by the dialog module,also
receives a string parameter, which specifies whether the dialog
end-points should be pinged via SIP options messages. The parameter can
be "P" to specify to only ping the caller, "p" to only ping the callee
or "Pp" to ping both dialog sides.
If the extra string parameter is provided at dialog creation and one
end-point fails to respond to a options ping ( 408 Timeout ), or if the
response is a 481 ( Call/Transaction Does Not Exist ) OpenSIPS will
terminate the dialog from the middle.
The interval between two SIP pings can be configured via a dialog module
parameter [2].
[1] http://www.opensips.org/html/docs/modules/devel/dialog.html#id293972
[2] http://www.opensips.org/html/docs/modules/devel/dialog.html#id292965
Regards,
--
Vlad Paiu
OpenSIPS Developer
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