[Asterisk-Users] SIP registrations

[Steve Woolley]

Can asterisk act as a SIP registrar or location server?
I would like to be able for a user agent(client) to register with
whatever client they are using as "username at domain-name.com". Rather
than the entry/username/password that is setup in the sip.conf file.
That way a user could log into any SIP enable client and their calls
would follow them around. 
I have read the sip.conf man pages and have noticed the following
commented lines in sip.conf:

;
;register => 1234 at mysipprovider.com     ; Register with a SIP provider
;register => 2345 at mysipprovider.com/1234 ; Register 2345 at sip provider
as 1234 here.
;

But I am a little confused how this should be implemented.

-- 
Steve Woolley 
ADS Telecom, Inc. 
59 Skyline Drive #1250 
Lake Mary, FL  32746 
Phone: (407) 682-6226 x1110 
Fax: (407) 682-3455 
swoolley at adstelecom.com