Asterisk multiple account problem


I’ve problem: asterisk(, M3 Snom phone(software 2.02) and 2 accounts registered into the same asterisk.
The problem is: outgoing calls for one account is working fine. When I’m trying call from another account I’ve got: 403 forbiden.
Asterisk is matching accounts according ip, port not username:

I’ve also tried to disable authentication (set password to “none”): outgoing calls are working fine but both calls are identyfied as “from one account”.

My astersik machine has multiple IP addresses.
When I change registar server to other IP at one account (soo both accounts have DIFFERENT registaqr IP addresses) everything is working fine.

I belive problem is:

How to fix it without this “additional IP”?

Best regards