Cisco VoIP IP SPA504G Setup & user guide page 5

Then you will need to enter your VoIP SIP/Account Number (In both sections below)
and also your password.
Then the last step is to then enter your VoIP SIP/Account Number again in the User
ID field and to make sure Use Auth ID has yes selected as shown below.
Now simply hit the submit all changes button at the bottom of the page and you
phone will now save the new settings and reset. This can take 30-180 seconds to
perform. Once it is finished your VoIP phone should now have some green lights
appears.
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