We have a Cisco 3660 and a ADSL line (2Mbit/s download, 0.5Mbit/s upload) over here. We recently added VoIP to our site. It works great since we just use it for internal communication, when going out it goes straight to a PSTN Gateway.
We also have some people working from home, recently, there has been a suggestion to equip these with IP telephones so that they may call via the companys VoIP system. So I made a simple test, I brought a phone home with me and just as I suspected there was trouble due to high latencys. I suspect this is due to ACK packets not getting through. For example, if I send at 0.5Mbit/s I can not receive more than a few kb/s, when lowering the upload speed to somewhere slightly less than 0.5Mbit/s I can download at near 2Mbit/s. So it seems as if ACK packets are not getting through. And since my voice calls are tunneled (using tcp packets), the VoIP calls are kind of 'laggy'. I need to prioritize ACKs from the office towards the Internet. But how?
I've been advised to use CBWFQ and so I have tried but with no success.
The problem you will run into is the lack of support for QoS in the public Internet.
Although you could classify and mark traffic entering the Internet over the ADSL link there is no guarantee that the marking will be acted on. The same applies for any fragmentation and Interleaving for the RTP streams, whilst this could be set up locally you have no control over the ISP routers, so any benefit is negated as soon as the traffic hits the next hop router.
I don't agree with aacole or rpgccie that you MUST have QoS end-to-end. That would be great in a world where money is no matter. But for most folks, you need to impose some QoS getting on and subsequently getting off the Internet. Those are the two choke points - not some big pipes in a telco backbone.
I have two 831's ( I think that is the model) to perform pilots for our 50 or so telecommuters to both VLAN and VoIP back into our corporate network.
In my experience you, this conversation really centers more around expectations than whether you need QOS end to end. I have seen both. If these are internal calls and the expectation is that every now and again the quality may suffer, then I say go for it (at least pursue it). If on the other hand, the people working from home face the customer, I would shy away from it.
I have weekly conference calls with telecomuters using soft phones over the public internet and with the exception of the occasional garble, it works very well.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.