Linphone
Log in to the phone and configure Linphone
Download
Support for IOS, Android, macOS, Windows, GUN/Linux
Download Link:https://www.linphone.org/
Login
Click USE A SIP ACCOUNT

Precautions: Please contact the business personnel to obtain Username, SIP Domain, Password
Transport: Please select UDP
Display name: Custom Caller

Login success
Green means login is successful

Update custom caller(Optionals)
Click Settings
Click Preferences
In SIP accounts > Proxy account, select the account and click Edit
Update SIP address*

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