Recently, several protocols have been created to allow telephone calls over IP networks, notably SIP [1] and H.323 [2]. These emerging standards have opened up the possibility of a broad and dramatic decentralization of the provisioning of telephone services so they can be under the user's control. IETF IPTEL work group has proposed an architecture in which network devices respond to call signaling events by triggering user-created programs written in a simple, static, non-expressively-complete language. This language is called Call Processing.
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