[Serusers] STUN problem (?)

[Lokotes]

Hi,

I've go a little confussion with such a scenario:

2 UA's supporting STUN are connetcted to SER.
In database records I can see their location. The first one which is 
lunched - registers itself with:
	sip:number at nat_ip:5060
when second UA is lunched, it's location looks like:
	sip:number at nat_ip:1030
but second UA says: 'Not registered'. The forst one works fine. What's 
the problem? Is it OK when 2'nd UA registers with other port than 5060?
May there be a problem with routing messages?

What am I doing wrong?
L.