http://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_play_and_get_digits
then
https://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_bridge

Since you want FS to initiate the call to A use this:
https://wiki.freeswitch.org/wiki/Mod_commands#originate
You can do that via ESL, XML RPC etc.

Notice you can give the dialstring for A as its first argument and then a dialplan extension as the rest where the play_and_get_digits+bridge can be performed.

-Steve


On 27 March 2014 02:48, Parimal Muli <parimalmuli@gmail.com> wrote:
Following is the use case that I want to achive using FS:

1. FS makes an outbound call to a PSTN user A.
2. A picks up the call and is greeted with a welcome message.
3. A then dials another PSTN number (that of user B) using the dialpad.
4. FS captures the number and calls B.
5. B picks up the call and FS joins A and B.  

--


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