Download the softphone installer from the official website at the link. Install it by following the instructions of the installer.
After installation, open MicroSIP, click on the button in the upper right corner to open the menu.
Choose "Add account"
In the "Account name" field, enter an arbitrary name for the account
In the "SIP Server" field and in the "Domain" field, enter the IP address of MikoPBX to which the connection is being made
In the "Username" field and in the "Login" field, enter the "Extension" from MikoPBX
In the "Password" field, enter the "SIP password":
Click "Save"
Thus, we connected the MicroSIP softphone to MikoPBX. Confirmation of successful connection is the inscription "Online" at the bottom left, as well as the inscription "Online" in MikoPBX