How to register

Settings -> Run assistant

Username: 41000009

Password: <password>

Domain: sip.wisephoneplus.com

Other settings stay the same

How to make calls

In the main screen

If you're going to call text contact, such as "john@sip.wisephoneplus.com", then click on "Phone number or Address" to access system keyboard, finally click Call button as normal

If you're going to call digit contact, such as "41000001",  use app's keyboard directly