❤❤❤❤Crystal Intercom Date & Time Programming | How to Know Port No. & Flexible No. ❤❤❤❤❤❤❤❤❤

Welcome to my Channel Shaquib Tech.In this video you will learn about:Crystal Intercom Programming. Crystal Date and Time Programming. How to Know Port Number? How to Know Extension Number? How to assign Extension Number? How to assign flexible Number?For Building intercom installation video click on below link;