How to write 4 digit numbers to 3 digit numbers in panasonic tde-200?

Question

ATS

There are internal 3 digit numbers in tde-200. I want to make some of the numbers 4 digits by adding the number "7" in front of the number. In PBX section 4.1.1 (setting the internal line), if registered, then when applying the settings, the error "invalid extension number entered (error of the extension number block)" is not saved.

Answer 1

In the numbering plan, you need to set the leading number, for example 71 (for numbers 71xx). additional digits - XX.
If not, check for 7 in features and replace.delete.
Next, we try to register the internal number.