asterisk users - Mar 2005 - not ringing when place outgoing call

I have configured asterisk to act as a B2BUA, so can use ser for sip proxying
and forward the call to a sip provider.

The problem now is that when I place a call to an outgoing number I don't
hear nothing up to the time the callee responds.

The first time I configured asterisk it was working fine. Now seems something
changed but I am pretty newbiw to understand where the problem is.

Can someone help me to understand what is going on?

Thanks
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