to give some context to what i was asking.... 14 people and myself are moving into an office space. we need to get an affordable high-speed connection and phone lines into the place. we all need separate phone numbers. i thought it would be cheaper to set everyone up with vontage service (or another voip service). so we thought it would be best to figure out what kind of bandwidth we need for the voip phones before choosing the most appropriate and affordable internet package.
vontage does say 90 kbs per line, but it didn't make clear if the phone always needs a 90KB connection or just when someone is using it. and if that's a 90kbs connection both up and down? this number seems like the easy and dumb way to calculate it. using it, that comes to about 1.4 Mb for 15 lines. That's about the speed of a typical small office dsl connection. so it looks like we'd want a 3mb connection or 2 DSL lines (if that's is possible).
also it sounds like all these voip modems should have hardline connections when possible (as opposed to using wireless-to-wired bridges to give uplinks throughout a large space). that's good to know.
if someone has had good experience, or could you recommend a voip and isp combo i'm all ears. not looking for anything fancy or too tech. easy of use is an issue. DSL Reports seems to favor packet 8.
thanks -Yury
On Nov 5, 2004, at 10:50 AM, Dustin Goodwin wrote:
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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