How many voip calls can you squeeze through an access point?

While
checking out the eTel conference website to create a list for Debi (aka mobile
jones) of sessions that I am interested in, I’ve stumbled over an interesting
article of Matthew Gast analyzing just how many Voice over IP calls can be
squeezed through a Wireless Access Point. 22 to 23 is the answer 😉 In the
article, Matthew goes into the details of preambles, WLAN, IP, UDP and RTP
headers and shows how they influence the data rate and total number of
simultaneous calls. The article also
gives a brief overview of the voice codecs used by a number of voip systems
(including Skype!) and their required bandwidths.