Internet Telephony Guest Editors: Mohsen Guizani, Ammar Rayes, Mohammed Atiquzzaman Active, Programmable, and Mobile Code Networking Guest Editors: Patricia Morreale, Kazem Sohraby, Bo Li, Yi-Bing Lin

Internet Telephony
Guest Editorial
Mohsen Guizani, Ammar Rayes, and Mohammed Atiquzzaman

Integrated Management Architecture for IP-Based Networks
IP telephony will bring about a dramatic change in the way IP services are planned,
provisioned, managed, and billed. The authors discuss an integrated management
support system for IP-based networks illustrating the functions needed to support
the unique challenges of managing VoIP services.
Ammar Rayes and Karen Sage

QoS-Enabled Voice Support in the Next-Generation Internet: Issues, Existing Approaches and Challenges
There still exist a number of barriers to the widespread
deployment of Internet telephony, such as the lack
of control architectures and associated protocols for managing calls, a security
mechanism for user authentication, and proper charging schemes. The most
prominent one, however, is how to ensure the QoS needed for voice conversation.
Bo Li, Mounir Hamdi, Dongyi Jiang, Xi-Ren Cao, and Y. Thomas Hou

iGSM: VoIP Service for Mobile Networks
The iGSM service provides user mobility to subscribers, which
allows them to use either GSM handsets or H.323 terminals
(IP phones or PCs) to access telecommunications services. The
authors describe how the iGSM registration, deregistration, and
call delivery procedures can be implemented without modifying
the GSM network.
Herman C. H. Rao, Yi-Bing Lin, and Sheng-Lin Cho

VoIP Mobility in IP/Cellular Network Internetworking
This article explores VoIP mobility in the context of IP and cellular networks
interworking. The proposed approach uses existing components in the
H.323 standard, thereby allowing VoIP mobility service in hybrid IP/cellular
networks to be a value-added feature in the existing H.323-compliant Internet
telephony systems.
Wanjiun Liao and Jen-Chi Liu

Performance Evaluation of the Architecture for End-to-End Quality-of-Service Provisioning
Real-time communications services over the Internet need a new architecture to
meet their required quality. From a viewpoint of quality of service provisioning
architecture, the Internet can mainly be divided into three types of subnetworks:
domain networks, access networks, and stub networks. In this article we focus on issues arising in the former two networks for end-to-end QoS provisioning.
Katsuyoshi Iida, Kenji Kawahara, Tetsuya Takine, and Yuji Oie

Real-Time Multimedia over ATM: RMOA
RMOA is a new ATM Forum standard addressing the transport of H.323 VoIP traffic over ATM-based Internet backbones. It defines a new H.323 gateway devised to
carry H.323 real-time media streams by taking advantage of the quality of service features of ATM. The approach is extremely efficient in that it reduces the protocol
overhead on the ATM transport.
Carlos M. Pazos, Marek R. Kotelba, and Andrew G. Malis

Building Blocks for IP Telephony
Convergence between the existing telephone networks and data transfer over the Internet not only demands that new software be written to handle telephony applications which span both networks, but also makes new and innovative applications possible. Rather than writing these applications from the ground up, it would be helpful to have a relatively high-level API on which to prototype new applications.
Donna Bergmark and S. Keshav

Internet Telephony: Services, Technical Challenges, and Products
The rapid proliferation of the Internet in the last few years has led to a strong interest in carrying telephony over the Internet. The Internet, however, was designed for non-real-time data communications, and hence it poses several technical challenges that must be overcome before the Internet can be successfully used for carrying telephone services.
Mahbub Hassan, Alfandika Nayandoro, and Mohammed Atiquzzaman

Active, Programmable, and Mobile Code Networking
Guest Editorial
Patricia Morreale, Kazem Sohraby, Bo Li, and Yi-Bing Lin

Secure Quality of Service Handling: SQoSH
Proposals for programmable network infrastructures, such as active networks and
open signaling, provide programmers with access to network resources and data
structures. The motivation for providing these interfaces is accelerated introduction
of new services, but exposure of the interfaces introduces many new security risks.
The risks can be reduced or eliminated via appropriate restrictions on the exported
interfaces.
D. Scott Alexander, William A. Arbaugh, Angelos D. Keromytis, Steve Muir, and Jonathan M. Smith

Active Distributed Management for IP Networks
The authors argue that a management platform for the future Internet has to be
inherently distributed and programmable. This motivates us to introduce a new
management architecture, named Active Distributed Management, which exploits
the active network and mobile agent paradigms and provides the properties of
distributed control and programmability inside the network.
Ryutaro Kawamura and Rolf Stadler

Active Routing for Ad Hoc Networks
Ad hoc networks are wireless multihop networks whose highly volatile topology
makes the design and operation of a standard routing protocol hard. With an
active networking approach, one can define and deploy routing logic at runtime in
order to adapt to special circumstances and requirements.
Christian Tschudin, Henrik Lundgren, and Henrik Gulbrandsen

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George Orphanos, Alexios Birbas, Nikos Petrellis, Ioannis Mountzouris, Andreas Malataras, Angus Goldfinch, John Brosnan, and Uros Janko

Opening Up Networks with JAIN Parlay
The authors describe the background and rationale behind the work of the
Parlay Group, together with the characteristics, structure, and capabilities of the
Parlay API. The benefits that Java and the JAIN Community bring to the
Parlay API are then explored.
Simon Beddus, Gary Bruce, and Steve Davis