Hi Daniel,
 
What does the log below means? Does it mean nathelper has issue to send the request to RTP proxy first or nathelper doesn't receive a response after sending a request to the rtp proxy?
0(27429) ERROR: nathelper [nathelper.c:2457]: can't send command to a RTP proxy
0(27429) ERROR: nathelper [nathelper.c:2492]: proxy <udp:210.13.124.15:7722> does not respond, disable it

There's no problem for the resource(CPU, mem etc.) on the server, the load is very low.
 
Thanks in advance!
----------
 0(27429) DEBUG: nathelper [nhelpr_funcs.c:148]: type <application/sdp> found valid
 0(27429) ERROR: nathelper [nathelper.c:3144]: no available proxies
 0(27429) ERROR: nathelper [nathelper.c:2627]: no available proxies
 0(27429) DEBUG: nathelper [nhelpr_funcs.c:148]: type <application/sdp> found valid
 0(27429) INFO: nathelper [nathelper.c:2369]: rtp proxy <udp:210.13.124.15:7722> found, support for it re-enabled
 0(27429) DEBUG: nathelper [nathelper.c:3196]: proxy reply: 42040 210.13.124.14
 0(27429) DEBUG: nathelper [nhelpr_funcs.c:148]: type <application/sdp> found valid
 0(27429) ERROR: nathelper [nathelper.c:2457]: can't send command to a RTP proxy
 0(27429) ERROR: nathelper [nathelper.c:2492]: proxy <udp:210.13.124.15:7722> does not respond, disable it
 0(27429) ERROR: nathelper [nathelper.c:3144]: no available proxies
 0(27429) ERROR: nathelper [nathelper.c:2627]: no available proxies
 
Thanks,
Kevin