Hi Khoa, Please go through the link http://www.pjsip.org/pjmedia/docs/html/group__PJMEDIA__MASTER__PORT.htm In case not fruitful, please let me know. Thanks and Regards, Gaurav -----Original Message----- From: pjsip [mailto:pjsip-bounces@xxxxxxxxxxxxxxx] On Behalf Of Khoa Pham Sent: Monday, January 28, 2013 6:33 PM To: pjsip list Subject: What is master port and port zero ? When reading conference bridge on pjsip.org/pjmedia/docs, I see these 2 port. What are they, are they the same ? When running pjsua_app, I use "cl" command to list port in conference bridge, I see pjsua_var.mconf->master_port->info->name = "Wave mapper" pjsua_var.mconf->ports[0]->name = "Wave mapper" pjsua_var.mconf->ports[1]->name = "ringback" pjsua_var.mconf->ports[2]->name = "ring" pjsua_var.mconf->ports[3]->name = "sip:voip1 at freesipserver.com <mailto:sip%3Avoip1 at freesipserver.com> " And it says ports[0] is transmitting to port[3], and port[3] is transmitting to ports[0] Any answer is highly appreciated, thanks in advance. -- Khoa Pham HCMC University of Science Faculty of Information Technology -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20130128/e2cbe06d/attachment-0001.html>