Asterisk / FreePBX sip trunk registration problem, Serious Network Trouble

The asterisk log file (/var/log/asterisk/full) shows entries like this:

[Sep  3 04:02:08] ERROR[3984] chan_sip.c: Serious Network Trouble; __sip_xmit returns error for pkt data

Solution: The server had been moved from one public IP-address to another. In Asterisk PBX settings, the fields for both External IP and Bind Address (under Advanced) needed adjustment to the new IP-address. After server reload everything worked normally.

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