atcomsystems.ca/forum Forums TDM Business Telephone Systems Avaya - Lucent Telephones & Systems outbound caller ID

Bottom line is that, in your dial shortcode telephone number you can add s (or si) plus the number you want to send. For example, the telephone number may look like Nsi301447E which would send 301-447 plus user's extension number (assuming extension matches DID).
Good luck. Mike