Very unfriendly to the novice have a complete call demo can provide foreign friends need support

[YC946586]

Describe the bug A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. '...'
2. '....'
3. '....'

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• OS: [e.g. iOS]
• A type of network between you and your callee/registrar server [e.g. NAT, firewall, etc]
• Version [e.g. 22]

App configuration (please complete the following information):

• Either an xml config: [e.g. App.config]
• or a code config: [e.g. custom IConfigurationProvider, fluent config]

Additional context Add any other context about the problem here.

[siniypin]

Kindly provide a description