15 calls over a single Wifi cell is difficult to achieve decent quality
as radio contention brings the whole thing to a halt before BW
constraints do. So even though from BW perspective you may be able to
fit 15 calls in. Contention for access to transmit will kill quality.
7-8 is a much more realistic number.
- Dustin -
Tom Atkins wrote:
It's not 100% clear from the original question if you were asking about bandwidth from
a WiFi perspective or from a wired perspective.
However if you want to have decent VoWLAN quality, then bandwidth is less the issue than latency and protecting the voice from other data streams. Decent VOIP quality does depend on delivering a consistent number of frames per second, and this can be very challenging with more than a few concurrent users per AP.
Some WiFi solutions out there are capable of protecting the VOIP traffic from
contention and other data streams so these might be worth investigating if VoWLAN is
your direction.
Good luck
Tom
-----Original Message-----
From: Dustin Goodwin [mailto:[EMAIL PROTECTED]
Sent: Thursday, November 04, 2004 8:48 PM
To: Yury Gitman
Cc: [EMAIL PROTECTED]
Subject: [nycwireless] Re: bandwith for 15 voip lines?
Are you going to use a Internet voice provider (like packet8 or
VoicePulse) to deliver lines into the office or are you going to setup a
IP PBX in the office?
If the calls will be coming in over Internet connection using PPP
framing on the Internet circuit:
26kbps per call for G.729 which is a low bit rate codec like cell phone
quality
82kbps per call for G.711 which toll quality
- Dustin -
Yury Gitman wrote:
hoping in someone will know,
been researching, can't find hard numbers. anyone you have a guess, if an office
wants 15 voip lines (separate numbers and phones) how much bandwidth should they have
for it all to work properly, with good audio quality?
and does this factor in regular office net access too?
thanks in advance,
Yury
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