1. A system comprising: a parameter value manager comprising one or more computing devices, wherein the parameter value manager is configured to: monitor a performance metric representing performance of processing phone-based communications using a first queue of a plurality of queues; determine, based at least partly on the performance metric satisfying a threshold, to modify an application configuration parameter value associated with processing phone-based communications; modify the application configuration parameter value to indicate a future phone-based communication associated with a first client account of a plurality of client accounts is to be processed using a second queue of the plurality of queues; and transmit the application configuration parameter value to a plurality of application servers; and an application server comprising one or more computing devices, wherein the application server is configured to: send a first phone-based communication to the first queue, wherein the first phone-based communication is associated with the first client account; send a second phone-based communication to the first queue, wherein the second phone-based communication is associated with a second client account of the plurality of client accounts; receive the application configuration parameter value from the parameter value manager; determine, based at least partly on the application configuration parameter value, to send a third phone-based communication associated with the first client account to the second queue; and send a fourth phone-based communication associated with the second client account to the first queue.