Hi, thanks to Ancuta Onofrei, a new member of Voice System's team, NATHELPER module now supports multiple rtpproxies - actually you can define multiple sets of rtpproxies - nathelper performs load-balancing over a set and the user can select the set. For more details, see: http://www.openser.org/docs/modules/devel/nathelper.html#AEN76 The definition of the rtpproxy socket was extended to allow definition of multiple sets. See: http://www.openser.org/docs/modules/devel/nathelper.html#AEN140 Also, a new function was added to set from script what set of rtpproxies is to be used. See: http://www.openser.org/docs/modules/devel/nathelper.html#AEN298 Example: # multiple sets of multiple rtproxies modparam("nathelper", "rtpproxy_sock", "1 == udp:localhost:12221 udp:localhost:12222") modparam("nathelper", "rtpproxy_sock", "2 == udp:localhost:12225") ..... set_rtp_proxy_set("2"); force_rtp_proxy(); ..... regards, bogdan