Automatic dialer to call phone number with extension

I am wondering if BroadcastBYPhone supports calling phone numbers with extensions. If so, please let me know how to input the extensions in the spread sheet.

It normally will not work. If the main number is answered by a receptionist, then then system will not be able to dial the extension.

If the main number is answered by an automatic system, such as an IVR system, then the system might be able to dial the extension after some fixed delay. To enter delay, please use commas. For example, to call 800-123-4567 with extension 333, you can enter 800-123-4567,,,,,,,,333. The more commas you have, the longer the delay. This is not guaranteed to work, but might work for some known numbers that you can test it first.