I have been running kamailio on local network including rtpengine and freeswitch.
Now i am configuring kamailio with my public IP(trying with stock kamailio configuration to get started)

#define WITH_NAT 

listen=udp:192.168.3.32:5060

listen=tcp:192.168.3.32:5060

advertised_address= "122.xx.xx.xx"

advertised_port="5060"

and also using rtpengine module at udp:192.168.3.32:22222

now the problems i am facing are 

1.> UA can't register with UDP transport(not even recieving any packets at server ,testing with IMSdroid).

2.>TCP is registering the user, but users can't make calls .

i've also noticed this error in /var/log/syslog when tcp ca't make calls

ERROR: <core> [tcp_main.c:4250]: tcpconn_main_timeout(): connect 100.68.181.111:50842 failed (timeout)

please help me out