A method of dynamically allocating media resources includes providing a plurality of microservices in a signaling server and receiving, by one of the microservices, a call message from a client capable of browser-to-browser communications. The call message includes an identifier specifying a target. The identifier is send by the microservice to a cache with a request for capability information of the target. The cache is configured to retrieve the capability information of the target using the identifier. The microservice receives the capability information of the target from the cache. The microservice sends a media resource request to a service directory server coupled to a plurality of media servers when the capability information of the target indicates that the target is not capable of browser-to-browser communications, and initiates browser-to-browser communications between the client and the target when the capability information of the target indicates the target is capable of browser-to-browser communications.