search for: dialagent

Hello I would like to know how can I manage to implement a table which translates an extension number into a phone number. Let see an example: If I dial an extension like 3021, Asterisk has to Dial an agent (our employees) located at San Francisco using the following telephone number: 415 541 XXXX. If it does not work we can also use his/her mobile number. We need to manage more than 180