I would presume esf refers to the T1 framing known as Extended Super Frame. This was developed to allow more maint and operating information to be passed between equipment elements. Dennis Hock. Nothing at all to do with SIP perse. -----freeswitch-users-bounces@lists.freeswitch.org wrote: ----- To: freeswitch-users@lists.freeswitch.org From: "Jonas Gauffin" <jonas.gauffin@gmail.com> Sent by: freeswitch-users-bounces@lists.freeswitch.org Date: 09/09/2008 03:25AM Subject: [Freeswitch-users] mod_esf and mod_fsv Hello What does mod_esf and mod_fsv do? mod_esf just says "Extra SIP Functionality" in the wiki. mod_fsv is not documented at all. Regards, Jonas _______________________________________________ Freeswitch-users mailing list Freeswitch-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org