Understanding core IP telephony architecture design and functionality is essential for successful application support and performance. IP telephony performance problems are often indicative of network traffic, capacity and traffic management issues, which will likely impact all network applications.
This collection of our best IP telephony tutorials and primers for 2010 covers IP telephony infrastructure migration and management strategies; the inherent challenges of IP telephony interoperability; how to overcome IP telephony interoperability and integration issues; and how to ensure the overall health of your network by maintaining IP telephony QoS.
telephony infrastructure basics
Moving to an IP telephony infrastructure represents a significant shift from more traditional voice services. Leveraging unified communications (UC) depends on understanding the differences between circuit- and packet-based communications and treating enterprise communications as a single entity rather than a group of discrete telephone systems. Learn how a centralized IP telephony solution effectively mobilizes users and helps businesses achieve least-cost routing for calls and extension dialing between locations.
telephony gateway primer
IP telephony gateways serve an important and ever-increasing role in an enterprise unified communications infrastructure, delivering both circuit-switched and newer packet-based telephony solutions to the enterprise. Initially designed to adapt analog voice, the gateways are now the conduit to bring video and data solutions to enterprise users, no matter where they may be. Learn how common protocols, like SIP, are used to connect gateways not only to services but all the way down to individual handsets. Also, find out how to overcome the inherent challenges of obtaining interoperability in a multi-vendor environment despite widespread adoption of open protocols.
and IP telephony integration: Understanding the challenges
IP telephony integration with collaboration applications can boost user productivity and streamline workflow, but piecing together varying iterations of UC and IP telephony protocols with voice services and other unified communications applications is challenging for both the uninitiated and seasoned professionals. Learn about the benefits and challenges of UC and IP telephony integration and the protocols and interfaces necessary to extend communication services to business applications.
telephony QoS: Capacity planning and management
Poor or irregular IP telephony QoS levels should alert voice managers to review network traffic, capacity and traffic management measures before problems spread to all applications on the network. Congestion occurs when network load exceeds network capacity for a period of time. The most effective way to manage congestion is to augment capacity. Learn how to pinpoint the cause of your IP telephony network congestion symptoms by assessing peak-level utilizations and analyzing link utilization along traffic routes, and find out how to use this information to solve your IP telephony performance problems.
telephony QoS: VoIP traffic management and prioritization
When congestion is not the root of IP telephony performance problems, it’s time to size up your network design. When adding capacity or limiting traffic from competing applications isn’t a viable option, VoIP traffic management and prioritization can help, but they can also increase the overall complexity of the network, raising the operations and support costs. Learn how prioritization and route optimization can resolve IP telephony performance issues by managing delay (handling delay, serialization delay, routing delay) and other factors that degrade VoIP traffic.
This was first published in December 2010