How to set up door bell function for 721-H?

Serial NO. : H00107016-EN

Date of Editing : 2011-06-24

Questions :  How to set up door bell function for 721-H?

Problem Solving :

1. 721H can make “#” button to be ring bell.

2. Enter programming mode (press “*123456#”)

3. Press “24*128#”  DDD value = 1 (Enable)*128 = 128