Bandwidth

[kolucoms6]

What kind of bandwidth Express talk uses per line ?

 

And how about if its ina conference ?

 

Any meter to find it out ??

[Guest nchto]

You can use a program such as NetMeter (www.metal-machine.de/readerror) to monitor the bandwidth used.

[kolucoms6]

What the approx copnsumption ?

 

And G729 codec available if i want to buy for Express Talk ?

[Guest nchto]

G.729 is a proprietary codec and as such it is not included in any of our software. When using an open protocol such as SIP (VoIP) we prefer to use open codecs.

[kolucoms6]

But each call using Express talk eats away more 100 kb/sec.

 

:-(((((

[Guest nchto]

Select the "prefer lower bandwidth usage" option from the audio tab of the options window. 100 kb/sec is far to much for any audio conversation, you likely have other programs which are using your bandwidth.

 

Using the default settings within Express Talk, it uses at most 10kb/sec.

[kolucoms6]

Wow .. Only 10kbps ?

 

Cant believe it..

 

So, If I have 256 KB/s of raw bandwidth of lease line..Can I use 10 agents on 10 different computers on Lan... with Axon and VRS on Server ?

 

It will include soemtime DTMF also..

 

Please guide..

[pythonpoole]

Express Talk (and all of NCH's other VoIP products) support two main protocols: G711 and GSM

 

G711 provides very good quality, but it uses a lot of bandwidth (~64 kbps or more)

 

GSM provides good quality and uses much less bandwidth (~13 kbps)

 

The thing is you will never get the full bandwidth you are allocated, especially when you're talking about an external ISP. For instance, I have an 8.0 mbit internet connection, but on average I can only use up about 4 mbit of bandwidth at a time due to external factors such as distance, quality of the connection, the amount of devices accessing the network etc.

 

So if you have a 256 kbps connection, even if your ISP was of a superb quality, and even if you lived next door to the telephone exchange where your internet connection is routed through.. you shouldn't expect to ever get your full 256 kbps worth, and should probably assume at any given time there is only about 128 kbps to work with.

 

However, if your modem/router supports QoS (quality of service) you can help prioritize VoIP call data so that it is guaranteed to get as much bandwidth as possible by limiting the bandwidth of other internet data (such as checking e-mail, or normal web browsing).

 

So what I'm saying is don't push it, you probably have a lot less bandwidth than you think. Tip: You can using speed meters available on the net (e.g. speedtest.net and the one at 2wire.com to estimate your actual available bandwidth).

 

Let me also add this: Most LANs have a bandwidth rate of about 100mbit, so you should have no problems handling several calls between users on your LAN. The thing to be worried about is several simultaneous calls to people outside of your local phone network. Remember that the bandwidth is only used when there is an active call (only very minimal data is sent when there is no call in progress). So in order to use up all your bandwidth you would have to have several calls taking place during the same time period.

[kolucoms6]

Even when my ISP commits me Raw 256 kbps 1:1 , I get only 128 kbps ?

 

In their SLA, they do mention that and they also prove it by keeping track of using some bandwith meter.

[pythonpoole]

Well I can't see how it would be possible to guarantee you exactly 256 kbps. Unless they feed 512kbps in your home and have programmed your router to limit your connection to 256kbps or something.

 

DSL connections drastically reduce their bandwidth with distance. I have an 8,000kbps connection, and I only receive about 3,500kbps at any given moment in bandwidth because I am 2.5 kilometers from my telephone exchange. There is a rule of thumb that after 4 kilometers the DSL connection quality will be so bad that you will be barely able to use it.

 

Now if you lived within a couple of hundred metres from the exchange, I would expect you would have pretty close to 256kbps in bandwidth. Likewise if you were using a non-telephone/dsl connection the distance may pay less of a factor. (E.g. if you have a Fibre Optic internet connection, you would most likely be able to use most of the bandwidth provided to you.

 

I suggest you use a speed meter on your end (e.g. the one on http://speedtest.net) as this will give you a relatively accurate measurement of the actual bandwidth you have available to use.