Cannot register to other sip server with 1.2.0

I am using asterisk on a gentoo not hardened and updated.
When I made the update to asterisk 1.2.0, I could not register anymore to an external sip server on port 5061

Going back to the previous version ( was 1.0.8 ), everything is fine. I used the same sip.conf file in both version.

Here is my register lines in sip.conf:

register =>
register =>

With the first line everything is OK, but I cannot register to the second voip provider specified in the second line.

Could anybody help me?
Thanks and regards.

Firewall / NAT problem? Have you got the relevant port allowed through the firewall or forwarded properly by the NAT - or whatever sort of setup you’ve using?