1. A system comprising: a session initiation protocol (SIP) adapter, wherein the SIP adapter implements connection oriented protocols and mediates interactions with application code in an application server; wherein said SIP adapter comprises a plurality of transport modules which receive a plurality of SIP messages associated with a plurality of calls in a telecommunications network and received via said connection oriented protocols over a plurality of connections, a parser which parses frames from said plurality of SIP communications and generates SIP stack events responsive to said SIP communications wherein each SIP stack event includes a connection id attribute corresponding to one of said plurality of connections, and an SIP event handler which dispatches said SIP stack events to an event broker; a plurality of stateful sever nodes each comprising a microprocessor and a memory; a plurality of call state objects hosted on the plurality of stateful server nodes, each of said plurality of call state objects corresponding to one of said plurality of calls; a plurality of actors wherein each actor owns one of said plurality of call state objects and wherein each actor comprises application code for handling the call associated with the call state object owned by the actor; wherein each of said plurality of call state objects comprises a transaction state object which includes a protocol layer state machine of a transaction of the call associated with the call state object; and an actor message handler which communicates said SIP stack events from the event broker to said plurality of call state objects; whereby the SIP adapter provides stateless node mapping of said SIP messages and said SIP stack events to said plurality of stateful server nodes hosting said plurality of call state objects corresponding to said plurality of calls and said plurality of actors associated with said plurality of call state objects.