Habe den gleichen Fehler.
Cisco 7912 mit SIP FW und Horstbox Pro FW 5.0
Dec 14 18:44:16 (none) local0.notice asterisk[921]: NOTICE[921]: chan_sip.c:12939 in handle_request_register: Registration from 'sip:400@
[email protected]' failed for '192.168.1.202' - Username/auth name mismatch...