RE: QOS on VOip,Voatm and VOfr

From: Donny MATEO (donny.mateo@sg.ca-indosuez.com)
Date: Thu Oct 17 2002 - 03:25:02 GMT-3

There area lotsa thing that you can do in Voice depending on the case.
1. Is ip rtp header compression
2. LFI (link fragmentation and Interleafing) to make sure packet delay is not more than 10 ms
3. MQC (do remember CBWFQ guaranteed minimum bandwith and that it's only kick in during congestion.
However voice is delay sensitive, so use LLQ instead).
4. Differentiated Services (DS) and Differentiated Services Code Point (DSCP)
5. Traffic shaping for Frame relay
6. RSVP LLQ + QOS for signaling Traffic.

there are rules to this optimation, like use ip rtp header-compression only on slow link and when
the number of call are small. Use LFI on link slower than 1.2 Mbps etc

the link below might help

http://www.cisco.com/en/US/tech/tk652/tk701/technologies_white_paper09186a00800d6b73.shtml

Donny

                                                                                                                                       
                      Pieter Jordaan
                      <pieterj@is.co.za To: "'Robert Massiache'" <robert2140@hotmail.com>, ccielab@groupstudy.com
> cc:
                      Sent by: Subject: RE: QOS on VOip,Voatm and VOfr
                      nobody@groupstudy
                      .com
                                                                                                                                       
                                                                                                                                       
                      17-10-2002 13:38
                      Please respond to
                      Pieter Jordaan
                                                                                                                                       
                                                                                                                                       

Robert

I have the same problem as you. I can configure RSVP, RTP, Random detect, ip
Precedence etc. But I am also not sure which one to use for a specific
scenario.

If the scenario says prioritize your voice traffic how do I know if I should
use RSVP or precedence 5 or RTP? Or if it says reserve bandwidth how do I
know if I should use CBWFQ or RSVP, or maybe a combination to both.

If anyone can shed some light on this I would appreciate it.

Regards
Pieter

-----Original Message-----
From: Robert Massiache [mailto:robert2140@hotmail.com]
Sent: 11 October 2002 08:47 AM
To: ccielab@groupstudy.com
Subject: QOS on VOip,Voatm and VOfr

Hi

I enough read all these QOS stuff in Cisco site and CD.
I can understand individualy.
But I am confident enough to choose the right one in the exam.

I request any one of you explain at your best.

Thanks and regards
Siva

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