It really doesnt matter what VoIP system you installed they all generally have one architectural characteristic in common; the configuration database. Depending on the system, you might find a database engine that ranges in complexity from an Access Database to a full blown SQL database. The database will store configuration information, status information and often, call detail records that document phone system activities. The characteristic of the database that is consistent across all architectures is the fact that there can only be one read/write copy of that database!
Some phone systems distribute the database across multiple servers. ShoreTel, for example, distributes component