System and method for operating a plurality of call centers

System and method for performing a task with telephone line...

System and method for performing a task with telephone line...

System and method for processing international telephone numbers

System and method for processing ported calls

System and method for processing ported calls

System and method for providing a busy signal to a communication

System and method for providing a communication session

System and method for providing a dial plan conversion in a...

System and method for providing an enhanced audio quality...

System and method for providing call management services in...

System and method for providing calling name services with...

System and method for providing communication on a wide area net

System and method for providing communications services

System and method for providing competitive access telephone ser

System and method for providing data connections between an...

System and method for providing intercept of international...

System and method for providing local number portability service

System and method for providing telephony services to remote...

System and method for providing telephony services to remote...