In my case we use the hardware VPN to tunnel back to corp... then my 3002 box gives out address's to my laptop and to my ip phone. The vpn tunnel basically extends cisco's network to my house, using the dsl line and my isp's network connection to make the connection. My phone and laptop then are devices on the corp network thru the vpn concentrator in the remote access network. I am not sure if the isp handing out dhcp address's will work for you...
If anyone else on the list is using IP telephony thru a provider, they may be able to help here..... Larry Letterman Network Engineer Cisco Systems ----- Original Message ----- From: "neil K." To: Sent: Tuesday, January 21, 2003 11:09 AM Subject: Re: Voice Over Internet [7:61467] > I have a couple of questions more. > 1) The IP addressing. The Ip address is assigned dynamically by Service > Provider and also the running NAT on the router, will it be an issue. > 2) In that case VPN would be a better choice or not. > > Neil > > > ""Bruce Enders"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > 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 [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=61495&t=61467 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
