Cannot add extension in 3CX

[Kwang Mien]

Hi,

I am using 3cx version 18 (update 16)

I could initially add 001 extension. Recently, i deleted this extension and tried to create 001 again. However, i could not and the error is
"Cannot use this number try another one". Pls see below

I tired other 3 digit extension starting with 0 , also cannot add.

However, i can add 3 digit extension starting with 1 e.g. 103

Can anyone advise how i can fix this issue ? (adding 3 digit extension starting with 0)



Thanks.

Regards,
Kwang Mien

 

[smoreno]

Is it already in use somewhere else? Check call queues, digital receptionists, ring groups, etc
Call it and see if someone answers

Thanks, it actually was a call Q, didn't see it.