[asterisk-users] Tutorial for SIP user

[giancarlo lombardo]

Dear all,
I'm trying to setup a SIP call with XLITE using my asterisk PBX, but I have
trouble, I see on XLITE console:

Registration Error: 503 - Service unavailable.
Someone have a tutorial or a step by step description how to do that ?

Thanks in advance

-- 
Giancarlo Lombardo
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