Solved this one myself: function dumpSessVars(session) { var svars = ["context","destination_number","caller_id_name","caller_id_number","network _addr","ani","aniii","rdnis","source","chan_name","uuid"]; svars.forEach(function (v) { cLog(1,"**************** SESSION VAR " + v + " : " + session.getVariable(v)); }); } From: FreeSWITCH-users <freeswitch-users-bounces@lists.freeswitch.org> On Behalf Of Francesco Facco de Lagarda Sent: sabato 10 marzo 2018 14:20 To: 'FreeSWITCH Users Help' <freeswitch-users@lists.freeswitch.org> Subject: [Freeswitch-users] javascript get session extension number Goodmorning to all. Can anyone please tell me how I can get the extension number that originated the session in javascript?