I have installed Kamailio with MediaProxy and asterisk on Amazon Server..

While kamailio/MediaProxy and Asterisk both running on different amazon's instance.

Kamailio : 1.5.0-notls

Firewall port is opened for mediaproxy from 10000-20000 (UDP), 5060 (UDP) etc on both amazon machine..

while I tried to play an audio... it plays sound file but unable to found audio on device.

when I put tcpdump on asterisk machine it gives following error...

# tcpdump -i eth0 udp portrange 10000-20000 -w test1.pcap

01:39:52.850279 IP (tos 0xb8, ttl 64, id 59, offset 0, flags [DF], proto: UDP (17), length: 60) ip-W.X.Y.Z.compute.internal.15246 > xyz.com.10010: [bad udp cksum 3cfd!] UDP, length 32
01:39:52.870279 IP (tos 0xb8, ttl 64, id 60, offset 0, flags [DF], proto: UDP (17), length: 60) ip-W.X.Y.Z.compute.internal.15246 > xyz.com.10010: [bad udp cksum 97fe!] UDP, length 32
01:39:52.890281 IP (tos 0xb8, ttl 64, id 61, offset 0, flags [DF], proto: UDP (17), length: 60) ip-W.X.Y.Z.compute.internal.15246 > xyz.com.10010: [bad udp cksum 75c0!] UDP, length 32