# How to make phone calls
You can call a phone number in the user profile, in the search field or in the address book dialer.
Phone calls will be possible only if your TrueConf Server is integrated with a PBX or VoIP service.
# Calls from user profile
If the phone number is specified in the user profile, you can click on the field with the number and the application will start a call to the user in the following format:
# From the address book search field
Enter a phone number in the international format in the search field. Next, click the Call button in the menu that appears below. For example, you can dial +1 (833) 878-32-63 to call TrueConf sales department.
You can also call extension numbers connected to your PBX.
For example, if a user has a 910 extension number, enter the string in
#tel:910 format in the search field of your address book to make a call.
# From the dialer
You can call a phone number from TrueConf client applications for Windows, Linux, macOS or Android by using the dialer. In the dialer window you can also view the list of the users whose phone numbers are added on TrueConf Server.
In TrueConf client application, you can access the dialer by clicking on the button located on the top panel: .