Asterisk,SIP Retransmission timeout

Question

I have created a sip trunk from One Asterisk(version 11.2.1) say \'A\' server to another Asterisk server(11.7.0) say \'B\', and I am getting sip response 200 ok.
But when I

Answer 1

Such situation can be spot when you have nat issues or firewall issue

See this article http://www.voip-info.org/wiki/view/Asterisk+SIP+NAT+solutions

For more info you can enable sip debug by using

 asterisk -r
 sip set debug on