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Voice Over IP (VoIP)
Source: www.atis.org
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Short Description: The ATIS Technology and Operations (TOPS) Council established a VoIP focus ... efforts pertaining to VoIP. The ATIS VoIP Work Plan was completed in 1Q 2004. ...
Content Inside: T e C H N O l O g y A N d O P e R A T I O N S C O u N C I l Priority Work Plan Voice Over IP (VoIP) Summary Issue Summary March 2006 VoIP is a technology that digitizes and compresses voice conversations into IP packets for transport over a public or private IP data network. Using this method, voice traffic can originate and be delivered to any point on an IP network that has a valid IP ad- dress. The voice information is sent in digital form using discrete packets rather than via dedicated connections as in the circuit-switched Public Switch Telephone Network (PSTN). Reducing the need for separate voice and data infrastructures, VoIP offers the promise of streamlined network management and operation. However, a full migration to VoIP technology will require industry-wide adoption of open standards, processes and requirements, both technical and operational in nature. The ATIS Technology and Operations (TOPS) Council established a VoIP focus group to create an industry technical work plan designed to identify needed standardization efforts pertaining to VoIP. The ATIS VoIP Work Plan was completed in 1Q 2004. Work Plan Recommendations The focus group developed an end-to-end interoperability reference model and identified over 40 specific actions needed with regard to VoIP standardization. Key focus group considerations regarding VoIP interoperability are as follows: Cooperative application of standards and recommendations for interoperability among carriers, service providers, and customers/users is a necessity for ensuring reliable, secure and functionally rich public telecommunications services. The application of VoIP elements and systems as new voice networks – and as additions within existing networks – brings about the need for new specifications that will ensure interoperability among the different technologies. Where interconnection is required with entities outside the domain of a single provider, specific operating requirements are needed to meet performance expectations for the collective telecommunications industry. Interoperability between VoIP and circuit-switched PSTN networks is required at many levels. This includes interoperability with physical interconnection; trunk and access signaling; service control and proxy messaging; Quality of Service (QoS); security; reliability; administrative information exchange; and addressing. Interoperable stability in packet-based internetworking scenarios could be achieved by concentrating standardization work primarily on one set of protocols. The focus group identified Session Initiation Protocol (SIP) as the appropriate protocol choice. Over time, it is assumed that SIP will displace other interworking protocols such as H.323 and BOCC at the edge of each interconnected network. Interoperability needs to be addressed at every point of interconnection of network com- ponents such as protocols, vendor implementation, carrier, and service interoperability.
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