Normal sip methods for transfer should "just work"

On May 14, 2015, at 6:06 AM, Dmitry Mordovin <dm@dwide.com> wrote:

Friends,

Could someone explain me how this feature works?

Using FS default configuration and free sip softphones.

Call transfer case - 1001 user call to 1002 and talks - then 1002 user transfer 1001 user to 1003 user - 1002 hang up - 1001 and 1003 continue talks

Is it possible?

How can do it?

Which technology (protocol, messages) using for it?

DTMF, FS application, SIP messages or else

Thank you!

Dmitr