Abstract: Systems and methods for subscribing to receive published events and publishing events in a distributed session initiation protocol (SIP) network are provided. A request can be obtained from an event subscribing user agent (UA) to subscribe to receive events from another UA, and information regarding the event subscribing UA and the other UA can be stored in a local storage. Additionally, information regarding the other UA is stored in a global storage accessible to multiple components in the SIP network along with an identifier of a presence server storing the information. In this regard, when an event occurs relating to the other UA, the global storage is queried to determine one or more presence servers associated with UAs subscribed to receive events of the other UA, and the event information or a portion thereof is transmitted to the one or more presence servers.

Abstract: Described herein are aspects relating to a system and method for scaling a session initiation protocol communication system that allows components of the system to be distributed and/or scaled across multiple and different hardware, networks, systems, and locations.

Abstract: Described herein are aspects relating to a system and method for scaling a session initiation protocol communication system that allows components of the system to be distributed and/or scaled across multiple and different hardware, networks, systems, and locations.