On 04/12/2011 01:54 PM, Derrick Ding wrote:
I wonder if there's any other mechanism that I can use to record the
state and can be used as flag.
That is because a stateful proxy is, by default, transaction-stateful.
A "call" is a dialog, which consists of several transactions. Proxies
are not, by default, dialog-stateful. It sounds like you're looking for
something that can persist throughout the lifetime of a dialog.
Fortunately, Kamailio does have a 'dialog' module that adds this
functionality. The doc page for the module is here:
http://www.kamailio.org/docs/modules/3.1.x/modules_k/dialog.html
If you set a dialog to be tracked using the 'dialog' module, you can use
so-called dialog flags:
http://www.kamailio.org/docs/modules/3.1.x/modules_k/dialog.html#id2965748
http://www.kamailio.org/docs/modules/3.1.x/modules_k/dialog.html#id2965808
These will be valid for the life of a dialog.
Another option--which also has the effect of being dialog-persistent,
but does not involve use of the dialog module--is to stow something in a
Record-Route header value, which I assume your proxy is adding:
http://www.kamailio.org/docs/modules/3.1.x/modules_k/rr.html#id2663290
http://www.kamailio.org/docs/modules/3.1.x/modules_k/rr.html#check-route-param-id
-- Alex
--
Alex Balashov - Principal
Evariste Systems LLC
260 Peachtree Street NW
Suite 2200
Atlanta, GA 30303
Tel: +1-678-954-0670
Fax: +1-404-961-1892
Web: http://www.evaristesys.com/
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