cloud SIP server that can be used for free
1 Click the link.
2 Select a tariff plan.
3 Click ACTIVATE and register (a letter to activate an account is sent to the e-mail).
4 Find settings for SIP server.
SIP numbers are given by the service automatically, they can't be set at random.
To get additional SIP numbers top up is required (even for the free plan).
You can create several accounts (using different e-mails) and subscribers from different accounts can talk to one another.
1 Add a driver and set it as shown below.
Video intercom is set in iRidium studio like SIP driver, but another SIP ID (Login) is used.
Manuals on setting concrete models of video intercoms can be found here.
A project for a control panel can be launched in the Emulator.