Neil, In broad brushstrokes the answers are sort of: 1. Variable delay is the worst enemy of Voice QoS. Queuing delays are sometimes very common in ISP-to-ISP connections. Putting Voice traffic on the Internet is a risky proposition if you have significant concerns regarding Voice quality. Making sure that each remote has significant bandwidth for the VOIP traffic is the first step. ISPs may be capable of providing some levels of QoS, but may be reluctant to do so. Most ISPs have significantly less queuing delay within their network than they do across connections to other ISPs. (VOIP across the same ISP backbone usually results in better than acceptable voice quality). It is usually the links that connect different ISPs that create the most problems. I have seen large VOIP implementations that achieved very good voice quality over a very large geographic area that was all served by one ISP. (Choose your ISP wisely).
2. VPN could hurt voice quality as some concentrators inject delay into the audio streams. Check the delay specs on any VPN concentrator you are thinking about using to see how much delay you can expect to have to deal with. 3. Solution? Most new Cisco routers and switches support QoS configurations that enhance the probability of achieving good voice quality within a network. I do not know the specs on their VPN concentrators off the top of my head. HTH Bruce neil K. wrote: >Hi Guys, > >I have a few questions regarding implementing VoIP. >1) Can I have different remote offices run VoIP if they have (DSL access of >Cable modem access) to the Internet, I mean running VoiP over internet as >there wouldn't be any QoS.I am not sure about the Quality of Voice in that >case.Also can the service provider of DSL or Cable provide us with some kind >of QoS so that the Voice quality can be improved. > >2)Will implementing a VPN solution help in running VoIP and how and what >are the different solutions and what vendors should I be looking at. > >3) Does Cisco have a solution for this. > >Thanks in advance. > >Neil. K. -- Bruce Enders Email: [EMAIL PROTECTED] Chesapeake NetCraftsmen o:(410)-280-6927, c:(443)-994-0678 1290 Bay Dale Drive, Suite 312 WWW: http://www.netcraftsmen.net Arnold, MD 21012-2325 Cisco CCSI# 96047 Efax 443-331-0651 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=61474&t=61467 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
