Jitsi and Push To Talk

[azaroun]

Hi all
Really thanks for this great App, Congratulations !
I compiled and make it and find it so useful.
I have started customize it for my own goal and again thanks all.
One feature is important for me, and that is push to talk (PTT)
In jitsi web site they said it is possible and is added feature to make ptt. ( Via SIP or XMPP ..?)
My server side cause SIP UA is FreeSWITCH.
Im gonna make it to PTT in jitsi.
Is it possible in jitsi-android? If yes, how?
Is it added to jitsi-android?
If not,can any body give me keywords to make it possible and develope it by myself? or even sample ?
It is really important for me and i really appreciate any help.
thanks all