Maybe a better question is there a different mechanism for tracking a SIP based call that orginated from Verto across multiple SIP based systems?  I suppose Homer can be used for this, but seems like the overkill solution. -------- Original message -------- From: Michael Jerris <mike@jerris.com> Date: 10/9/17 2:30 PM (GMT-05:00) To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org> Subject: Re: [Freeswitch-users] session id (rfc7329) support (VoIP and Verto)? We do not, and most certainly do not in Verto as this is a SIP spec. On Oct 6, 2017, at 1:50 PM, Mundkowsky, Robert <rmundkowsky@ets.org> wrote: Does FreeSWITCH have session id (rfc7329) support (VoIP and Verto)?  Robert