This document discusses app_mongodb, an Asterisk application that allows interaction between an Asterisk PBX and MongoDB. It provides a prototype implementation with around 300 lines of code that allows basic operations like replacing a caller ID name by looking up the caller's number in a MongoDB phonebook. With further development, it could enable capabilities like real-time accounting for billing and fraud detection by accessing MongoDB datasets, as well as integrating the PBX with CRM systems through MongoDB. Resources are provided for the app_mongodb codebase and tutorials on MongoDB and Asterisk.