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1) Use Custom Sip Settings/Define manually

2) In Account Settings:

Title:  just any name to designate what phone system your on username:     extension number Password:    extension password

Servers: Sip Server/Domain/Realm Address  =   Domain name of PBX      (example:  joes.reseller.com)   Port: 5060

Outbound Proxy  (must be checked to work!) Address  =   Domain name of PBX     (example:  joes.reseller.com)  Port: 5060

Advanced – leave defaults unless required

It should register if the credentials are all filled in correctly and if pasting, make sure no spaces were added.