SIP trunk Problem

I have credentials from local voip server and that is only for incoming and I can connect through xlite and can received calls but when I want to peer my asterisk (1.2) with particular server it return (Sip_req_timeout) error another thing my service provider does not use default sip port instead it uses 3128 and when I enter at cli “sip show registry” it shows “ip:3128 request sent”
is it port problem? or any other issue and
in xlite is running fine no problem.


your help is required



thank you

My configuration is as follow

SIP.conf

Register => usernameassword@ip:3128
type=user
Username=test
Password=test
Allow=all
Host =ip address:3128
Context=abc

Exten.conf

I make appropriate dial plan
My distribution is CentOS 4.3 and service provider I know nothing other than username and password

Some one told me that your destination server may be behind nat and your asterisk not able to reach that destination, in xlite it connected because its have STUN server.

So i installed STUN server but I don’t know how to integrate asterisk with STUN so that my sip request from asterisk server can reach behind nat?