[Serusers] Where to register ?

[G. P.]

Hi all,
I have a quick question I have 2 different WLAN SIP
domains 
say domain1.com and domain2.com. Each domain has its
own ser (proxy + registrar).
Now a user from domain1 (sip:user1 at domain1.com) is
located in domain2 and tries to register ....

Is he going to register in domain2 registrar with uri
sip:user1 at domain1.com ??
OR 
is he going to register in domain2 registrar with uri
sip:user1 at domain2.com ??
OR 
is he going to register in domain1 registrar with uri
sip:user1 at domain1.com ??

Thanks 
George

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