IOS 12.1.2T has generally been the recommended one, but I believe 12.1.5T is
now out.
Steve
"Priscilla Oppenheimer" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> I think the best IOS version to use for VoIP came up in an earlier thread,
> so you might want to search the archives or perhaps people can remind us.
> Cisco made quite a few updates and bug fixes in the QoS for voice about a
> year ago, but I can't recall the IOS version number. Help anyone?
>
> Priscilla
>
>
> At 09:12 AM 1/10/01, Ishtiaque Mahbub wrote:
> >All,
> >
> >Thank you so much for contributing. (Oh my God, Priscilla has given an
> >answer to my question!! this must be my big lucky day!! have taken a
print
> >out of the reply and kept it in my personal file, i will show it to my
> >grand child someday!!)
> >
> >One last question though, and that is, if IOS 12.x is good enough to
> >implement VoIP, or do I need to ask for additional features? Pardon for
> >not adding the question in the first place (I am bit sluggish, as you may
> >have noticed, in my thinking process!)
> >
> >
> >Regards
> >
> >Ishtiaque
> >
> >>From: Priscilla Oppenheimer <[EMAIL PROTECTED]>
> >>To: "Ishtiaque Mahbub" <[EMAIL PROTECTED]>,[EMAIL PROTECTED]
> >>Subject: Re: Bandwidth constraints for VoIP
> >>Date: Tue, 09 Jan 2001 15:45:59 -0800
> >>
> >>Each CODEC has different capabilities for compressing voice, so you'll
have
> >>to know which CODEC you want to use first.
> >>
> >>The compressed voice is then put into an IP frame, so you will need to
take
> >>into account the bandwidth used by headers of the following sizes:
> >>
> >>20-byte IP header
> >>8-byte UDP header
> >>12-byte Real-Time Protocol (RTP) header
> >>
> >>On point-to-point links those headers can be compressed down to just a
few
> >>bytes. Even the IP header can be compressed if it's a point to point
link
> >>and IP addressing isn't needed for forwarding to the next hop.
> >>
> >>If you use Voice-Activity Detection (which uses no bandwidth during
> >>silence) you can further reduce bandwidth requirements.
> >>
> >>Finally, you need to take into account the data-link header, PPP, Frame
> >>Relay, whatever.
> >>
> >>According to a chart that I picked up at Networkers a couple years ago,
> >>here are a few examples:
> >>
> >>G.729 CODEC on PPP without compressed IP/UDP/RTP and without VAD uses
> >>26.4Kbps.
> >>
> >>G.729 CODEC on PPP with compressed IP/UDP/RTP and without VAD uses 11.2
Kbps.
> >>
> >>G.729 CODEC on PPP with compressed IP/UDP/RTP and with VAD uses 5.6
Kbps.
> >>
> >>G.729 CODEC on Frame Relay without compressed IP/UDP/RTP and without VAD
> >>uses 25.6Kbps.
> >>
> >>G.729 CODEC on Frame Relay with compressed IP/UDP/RTP and without VAD
uses
> >>10.4Kbps.
> >>
> >>G.729 CODEC on Frame Relay with compressed IP/UDP/RTP and with VAD uses
> >>5.2Kbps.
> >>
> >>I would copy and paste the whole chart but I only have hard copy. You
> >>should be able to find such a chart somewhere though.....
> >>
> >>Priscilla
> >>
> >>
> >>At 11:47 AM 1/9/01, Ishtiaque Mahbub wrote:
> >>>Hello Group!
> >>>
> >>>A very happy new year to you all!
> >>>
> >>>I was wondering if any one could advise what is the minimum Bandwidth
> >>>required for Voice Over IP installation on Cisco Routers (Router Series
will
> >>>be 2600).
> >>>
> >>>Is 64kbps is too steep for 4 simultaneous voice operations?
> >>>
> >>>Suggestion, advices welcome.
> >>>
> >>>Regards
> >>>
> >>>Ishtiaque
> >>>
>
>>>_________________________________________________________________________
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> >>>
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> >>
> >>
> >>________________________
> >>
> >>Priscilla Oppenheimer
> >>http://www.priscilla.com
> >
> >_________________________________________________________________________
> >Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
>
>
> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com
>
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