Provides Flexibility to Meet your Growth Challenges without Limits Changes your Single Line Phone into a Multiple Line Phone Multiple Call Appearances One of the most powerful features of Centrex ISDN is multiple call appearances.
Most users take three.
This means you can handle more than one call at a time with only one phone number. You are in control. Here's an example of just how powerful this is. Because you have three appearances of your number, while you are talking on the phone, you see the calling line identification of the other call coming into your number. It's your decision to answer the new call or not.