Convergence Advantages; Managing Ip Telephony Vpn Issues - Avaya Application Solutions Deployment Manual

For more information, see:
IP Voice Quality Network Requirements Website
IP Voice Quality Document (.PDF)
The following sections cover the topics:

Convergence advantages

Managing IP Telephony VPN issues

Conclusion
Convergence advantages
For increasing numbers of enterprises, the VPN carries not only data, but voice
communications. Though voice communication over IP networks (IP Telephony) creates new
quality of service (QoS) and other challenges for network managers, there are compelling
reasons for moving forward with convergence over maintaining a traditional voice and data
infrastructure:
A converged infrastructure makes it easier to deploy eBusiness applications, such as
customer care applications, that integrate voice, data, and video.
Enterprises can reduce network costs by combining disparate network infrastructures, and
eliminating duplicate facilities.
A converged infrastructure can increase the efficiencies of the IT organization.
Long distance charges can be reduced by sending voice over IP networks.
Voice over IP VPN is emerging as a viable way to achieve these advantages. The emergence of
public and virtual private IP services promises to make it easier for customers, suppliers, and
businesses to use data networks to carry voice services. As with any powerful new technology,
however, VPNs require skilled management to achieve top performance. The highest network
performance becomes imperative when the VPN network must deliver high-quality voice
communication. Not all IP networks can meet these quality requirements today. For instance,
the public Internet is a transport option for voice communication only when reduced voice
performance is acceptable, and global reach has the highest priority. When high voice quality is
a requirement, ISPs and Network Service Providers (NSPs) can provide other VPN connections
that meet required Service Level Agreements (SLAs).
Managing IP Telephony VPN issues
This section provides information on:
Communication security
Firewall technologies
Network management and outsourcing models
Issue 3.4.1 June 2005
VPN
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