HD Voice

HD voice represents a new generation of high-quality voice services for communications service providers. Through the use of wideband codecs on next generation IP networks, HD voice allows users to have clearer, greater quality and more effective voice communication

  • Introduction
  • HD Alliance
  • Requirements
  • Resources

As the telephony services market becomes increasingly commoditised the drive towards HD services represents an opportunity to gain a competitive advantage by differentiating services based on quality. Quality of voice services is still a critical measure of success. Service providers and vendors deploying HD Voice solutions will be able to attract new customers, reduce churn and potentially achieve greater revenues. Studies have shown that the duration of a call is longer when the call quality is higher.

The Benefits of HD Voice

With numerous communication tools now available, such as IM, SMS & E-Mail, Voice calls are used when direct, real-time interaction is required. The improved quality of HD Voice will mean that callers are likely to speak for longer and less likely to revert to alternative means of communication.

The growth in the number of call centres utilising voice recognition technology to efficiently manage and route inbound calls, the improved clarity of HD Voice will improve the interaction with speech recognition engines. It will also process caller's instructions more efficiently, resolving some of the anomalies and frustrations usually associated with speech recognition.

Within audio conferencing environments, the superior voice quality will result in more natural and easier to understand conversations, higher focus on conversation hence faster interaction and shorter calls, particularly where participants have regional and international accents.

HD Voice Eco-System

The mass adoption of HD Voice is dependent on three factors:

HD voice services being offered by service providers. There have been a number of service providers, fixed, wireless and web 2.0 announcing HD plans and this is expected to grow. Service Providers not planning to introduce HD Voice services risk losing subscribers to higher quality providers.

HD Voice also needs to be supported at the handset/CPE level. The end-user device must be able to process HD codecs such as G.722, AMR-WB and G.711.1. This challenge is already being addressed by vendors.

Cross-Network availability of HD. Currently most HD Voice services are limited to within the service providers' network, essentially creating "HD Voice Islands". A scalable, multi-lateral all-IP federation based interconnection platform is essential for HD Voice to achieve mass adoption.

XConnect has led industry efforts to encourage the adoption of HD Voice by launching the world's First HD Peering Federation. The HD Alliance enables multiple HD Ready networks to interconnect with each other via a secure connection to XConnect's scalable, multimedia interconnection hub.

The HD Alliance is enabled by XConnect's market leading Global Alliance service. Global Alliance is a suite of policy driven, neutral and trusted Carrier-ENUM registry and interconnection services that simplifies the process of interoperability and interconnection between networks. With a single connection to the Global Alliance interconnection hub, service providers are able to bypass the PSTN to exchange VoIP calls, such as HD, with other Global Alliance member networks worldwide, seamlessly enabling secure and scalable routing between VoIP, NGN, IMS, and mobile networks.

For more information or to apply to join, please complete the form







Service providers wanting to join the HDAlliance must be able to support the following :-

  • Number Uploads - Members must upload their subscriber numbers to the XConnect Registry. Number uploads can be performed via .CSV file upload to the web portal, scripted via API, or by sending to XConnect Support.

It's recommended that trial participants load all their numbers into the registry in order to determine what percentage of calls completed between providers were HD end to end.  Participants need not distinguish which numbers are HD (G.722) compliant.

  • Registry Query - Members must support either ENUM or SIP Redirect query via the Public Internet.
  • SIP Trunks - Members must support SIP interconnection, via the Public Internet.
  • Codecs Supported - The XC solution is transparent to the VoIP Codecs used, and these are negotiated between end-points following standard SIP operations.

However, the intent of the trial is to demonstrate HD Voice, therefore all Members should support at least G.722 for HD Voice, and G.711 for standard voice. Support for other variant codecs is optional. XConnect will not be supporting transcoding at this time.

  • Test Number - Members should provide an automated test number (eg. an IVR system or similar) which will be used by other Members for connectivity testing.

For more information or to apply to join the trial please complete the form.