ASTERISK / FAX / Sobi solution

We are looking for someone to built on Asterisk , / Preferably TRixbox. I need to build a solution where i can have 100-1000 phone numbers, and connect email accounts to these numbers.. Fax to email email to fax service basically. The management needs to be simble and possibly fronted by a sobi / service.. where a third party provisioning system can talk to the system. .