Back to the future with this Airheads Online article from 2007
While Wi-Fi offers a number of different security options, many voice handsets only support a subset because of processing, cost and battery considerations. Therefore design of a WLAN for voice may entail compromising over-the-air security to accommodate available handsets.
We believe the correct approach is as below: first choose a handset, then see if it can support the desired security model (the goal should be that voice and data work at the same level, e.g. WPA2/802.1x). If the handset cannot attain this level, the network designer should take steps to make sure that they can be allowed onto the network, but that special security measures prevent intruders from posing as voice clients to hack into the network, as explained below.
Handing over a voice call from AP to AP is a function of both the infrastructure and the client. While handover latency can be measured under laboratory conditions, there are many additional factors that affect real-life performance.
Good battery life is an important usability consideration for voice-over-Wi-Fi installations. While much battery-saving technology depends on the handset, there are a variety of functions where the infrastructure can assist in extending battery life.
Wi-Fi Alliance Certifications
The Wi-Fi vendors and other interested parties take standards developed and published by the IEEE 802.11 committee, but most vendors today tend to develop to certifications of the Wi-Fi Alliance, a group of vendors formed to develop the market for 802.11 (and the originator of the term ‘Wi-Fi’, Wi-Fi logos, etc).
Wi-Fi Alliance certifications are nearly all derived from subsets of the IEEE standards, and result in standardized tests to ensure inter-vendor interoperability. The notes above identify the most important certifications, but they are re-stated below (this is a subjective rather than a complete list: these are most relevant to voice-over-Wi-Fi infrastructure for Enterprise). In selecting a WLAN vendor, it is more practical to ask for a roadmap for these certifications rather than references to IEEE standards.
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