Abstract
Because of the emergence of heterogeneous access devices and
diverse wired and wireless networks, and a substantial lack of support
for integrating these networks, we are building a communication network
and a service infrastructure that provides integrated telephony and data
services across these networks. We generalize the basic call service to
support communication between two or more call parties using any number
of devices through any media. Call setup has already been addressed by
protocols such as the session initiation protocol (SIP), so we focus on
a missing component: scalable and fault-tolerant call session
maintenance and control after call setup. In this paper, we present a
new signaling protocol that offers scalability, high availability,
robustness, and flexibility in creating new call processing services.
The protocol is compatible with existing call setup protocols, but
provides lightweight call session management using a completely
decentralized, soft-state group control protocol. We show that this
approach simplifies the implementation of the basic call service,
including multi-device calling and service handoff between diverse
access networks. The design of our protocol follows the principle of
separation of control (signaling information) from data. The signaling
protocol has been implemented in ICEBERG, an IP-based core network
testbed with access to heterogeneous networks
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