what is the quality like with VOIP when used with broadband 1000

[computer]

I am currently using broadband 2000 for VOIP which works fine,
now I might have to change to 1000.

Who has experience with this?
Is VOIP , using a FritzBox still possible to use with broadband 1000?
What is the voice quality like with that lower bandwidth?

Appreciating your feedback.

[mattpark]

Hi,

Yeah sure thing its more than possible.

Ultimately it depends on the codec your VoIP provider is using, or the one you have chosen to use.

The most common codec G7.11 takes up 64Kbps. If your going to end up with 1mb/s connectivity then you can do the maths.

If the average VoIP call requires 64 kb/s, then a 1mb/s Internet connection can support 16 simultaneous calls and nothing else. If half your 1mb/s connection was used for web surfing, email and download, and the other half for phone calls, then your connection can only support 8 phone calls.

Don't forget to take in to account that many people don't actually get the full broadband speed they think this should. So knock a bit of bandwidth off for that just in case. Also if you don't have a QoS router, your other network traffic may effect you VoIP calls. Technically you should get 16 calls at once, but if your using the same connection for data and have a QoS router, i'd say you should be getting 5 calls no problem.

Of course if you are prepared to loose a bit of call quality you can use a lower quality codec, like G.729 which only uses 8 Kbps. Its all depends on what your provider supports, and what your endpoint (handset or softphone) can support too.

Hope this helps.

Matt


Edit: Your Fritzbox will support most codecs. What provider are you using?

[mattpark]

I thought i'd drop this list of common codecs in here for future reference too:


* GIPS Family - 13.3 Kbps and up
* GSM - 13 Kbps (full rate), 20ms frame size
* iLBC - 15Kbps,20ms frame size: 13.3 Kbps, 30ms frame size
* ITU G.711 - 64 Kbps, sample-based Also known as alaw/ulaw
* ITU G.722 - 48/56/64 Kbps
* ITU G.723.1 - 5.3/6.3 Kbps, 30ms frame size
* ITU G.726 - 16/24/32/40 Kbps
* ITU G.728 - 16 Kbps
* ITU G.729 - 8 Kbps, 10ms frame size
* Speex - 2.15 to 44.2 Kbps
* LPC10 - 2.5 Kbps
* DoD CELP - 4.8 Kbps

Some codecs require payment of royalties for their use in a product or program.

[computer]

Hi Mattpark,

Many thanks for your detailed answer.

Not sure about the codecs used at the provider,
but from your details I take that regarding voice quality , even if only for one call at a time,
one can say:
the higher bandwidth the better.

That's why I should stick to 2000+.

Thanks for your help.