set context iuid for CANCEL requests to let isflagset function return the right value in case a dialog flag was previously set on the call

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#### Description <!-- Describe your changes in detail --> Using kamailio 5.4 version, we have seen that dlg_isflagset is not detecting a dialog flag set in the request route for the initial INVITE, when a CANCEL request arrives.

We have applied this change to set the dialog context unique ide for this request. Since it's done on dlg_onreply, dlg_onroute and dlg_ontimeout functions. This way, dlg_get_by_iuid(&dctx->iuid) in the function ki_dlg_isflagset is not NULL and dialog flags are detected.

Is this change correct? Or can it generate any kind of issues?

thanks a lot and regards David You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/3096

-- Commit Summary --

* dialog: set context iuid for CANCEL requests to let isflagset function return the right value in case a dialog flag was previously set on the call

-- File Changes --

M src/modules/dialog/dlg_handlers.c (3)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3096.patch https://github.com/kamailio/kamailio/pull/3096.diff