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.