I install rtpproxy and config as follow, but it didn't work, is my config OK ?

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")

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Best Regards, Shengy