Get rtpptoxy from their repo and compile it On Sat, Jun 3, 2017 at 3:06 AM sgy &lt;nucsgy(a)163.com <mailto:nucsgy@163.com>> wrote: I install rtpproxy and config as follow, but it didn't work, is my config OK ? errorlog: Jun 3 15:00:56 iZ2ze3uk97m2bfv681kyx4Z /usr/local/sbin/kamailio[28971]: ERROR: rtpproxy [rtpproxy.c:2552]: force_rtp_proxy(): *incorrect port 0 in reply from rtp proxy* Jun 3 15:00:58 iZ2ze3uk97m2bfv681kyx4Z /usr/local/sbin/kamailio[28971]: ERROR: rtpproxy [rtpproxy.c:2552]: force_rtp_proxy(): incorrect port 0 in reply from rtp proxy My config: PUB_IP: public ip of kamailio PVT_IP: private ip of kamailio 1. start rtpproxy rtpproxy -l PUB -s udp:localhost:7722 -F 2. kamailio.cfg #!define WITH_MYSQL #!define WITH_AUTH #!define WITH_ALIASDB #!define WITH_USRLOCDB #!define WITH_NAT listen=PVT_IP modparam("rtpproxy", "rtpproxy_sock", "udp:localhost:7722") -- Best Regards, Shengy