Hi Alex, Thanks for your quickly response! I will try another way to do this. Thanks and Best Regards, Charlie -----Original Message----- From: sr-users [mailto:sr-users-bounces@lists.kamailio.org] On Behalf Of Alex Balashov Sent: 2017年11月27日 13:44 To: Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org> Subject: Re: [SR-Users] Does Kamailio support RFC4117? Hello Charlie, Since Kamailio simply relays SDP between UAs, it does nothing to either advance or hinder the use of 3PCC-style negotiation. -- Alex On Mon, Nov 27, 2017 at 05:40:26AM +0000, Ye, Charlie (NSB - CN/Qingdao) wrote: -- Alex Balashov | Principal | Evariste Systems LLC Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/ _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users