4.  Hover cursor over [Accounts]. Select [Account 1] and click [General Settings]. 
 
 
 
SIP Server and Outbound Proxy Login: Enter Login Server. 
Account Name, SIP User ID, Authenticate ID: Enter Unique ID (10 characters).  
Authenticate Password: Enter Registered Password (sent thru mail). *If password was 
changed, please enter the new one.  
Voicemail User ID: Enter 999.  
Once done, click [Save and Apply] 
Set on both accounts. *Note that they must have different registered UID’s