With VoIP being enabled, you are now able to make phone calls from an iPad.
1. Open up the Doximity application on your iOS device and tap on the 'Dialer' tab
2. Tap on the 'Settings' button
3. Under Voice Calling, tap on the toggle button next to 'Use Internet to Place calls' and 'Enable Phone Calling'.
PLEASE NOTE: You are not able to do a 3-way conference call on the iPad. Also, any iPad running anything less than iOS version 13.0, will not see the option to 'Use Internet to Place calls'.