yealink SIP-T38G unable to register

hi i have a Yealink SIP-T38G when i try to setup the SIP account and register on my Yeastar S20 i get the message "
Register Failed "
  Version phone yealink T38G
   Firmware Version
   Hardware Version
can you help me?

extension exist and id and password is correct.

can you help me?

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