[Freeswitch-dev] Searching for a valid extension

[Mathieu Parent]

Hello,

2010/10/1 Geovani Ricardo Wiedenhoft <grw.freeswitch at gmail.com>:
> Hello,
>
> We are completing development of the mod_khomp endpoint for Khomp boards:
...
>
> However, we are constrained in our implementation. We needed to verify that
> a given set of digits has a valid extension or if can wait for more digits
> at some points of our code, without making the call.

I have already encountered this during the mod_skinny development. I
asked the question to anthm on IRC and implemented what he suggested.
This is mainly done in function skinny_session_dest_match_pattern() in
src/mod/endpoints/mod_skinny/skinny_server.c.

As processing all the dialplan can take too much CPU, a simpler
dialplan is created which is named skinny-patterns. The conditions are
processed like in a normal routing (Code was stolen from
switch_core_standard_on_routing) with less and simpler expressions.
Also specific commands are parsed instead of the common ones.
Currently, those are skinny-route, skinny-drop and skinny-wait (only
wait forever implemented).

>
> In our implementation for Asterisk (our Khomp channel), we use the functions
> provided by the Asterisk:
>
> #############################################################################
> ASTERISK:
>
> /* \brief Looks for a valid matching extension */
>  - ast_canmatch_extension
>
> /* \brief Looks to see if adding anything to this extension might match
> something. (exists ^ canmatch) */
>  - ast_matchmore_extension
> #############################################################################
>
> Searching for a solution, we implemented within mod_khomp the reading and
> checking functions of digits and expressions in XML, but our implementation
> limits us to XML dialplans, which it would not be compatible if the user
> need the database or other constructions of the dialplan.

You don't need to parse XML, the "dialplan_interface" does it for you.

> So, I would like to know what is the possibility of similar functions to be
> implemented in the core?

There is no such function now in the core but we can work together to
implement one. There was some though on this in
http://jira.freeswitch.org/browse/FS-477. We need a way to be able to
call 123 as well as 1234/

> Thanks
> :)
>
>
> Geovani Ricardo Wiedenhoft
-- 
Mathieu Parent