need to make manager IP phone receive call from only specific extension

We want to install new user. Number will be 0126384445 and ext no: 4000. About access permission: 3001, 3002, and 3003  can call 4000. Other extensions can't call the number.

Solution :

1) create intra prefix 400 with custom 1 

2) Assign the customized call right cus1 to supervisior users 

As example of for user 3001

·        From web page of u1900 Choose User > SIP User.

·        Select user 3001 and click Service Configuration.

·        Choose Complex service > Outgoing call right and click Configure. 

          Select Custom 1