[VOIPSEC] How QOS of VoIP call is measured

[Bincy K. Philip]

Hi ,


I find one thing confusing.

I found in a voip application ,RTCP is not implemented.But with WinEyeQ(a free voip quality measurement tool),i got the MOS as 1.2(out of 5)..But the manual hearing quality is good. 

How was the applicatin got this value?


Thanks & Regards
Bincy K Philip


-----Original Message-----
From: Yusuf Mayet [mailto:jojo786 at gmail.com]
Sent: Friday, November 16, 2007 7:05 PM
To: Bincy K. Philip
Subject: Re: [VOIPSEC] How QOS of VoIP call is measured


RTCP will not affect the voice. It just measures, thats all.  An
application that collects RTCP stats could do things like select the
best route based jitter, etc.  RTP is independent from RTCP, so the
actual quality of voice does not depend on RTCP.  RTCP does not
have/need to be there to have good quality.

On Nov 16, 2007 11:10 AM, Bincy K. Philip <bincy.philip at nestgroup.net> wrote:
>
>
>
>
> So if the application support only the RTP for transfer of data (no RTCP) it
> means QOS is not supported and we can't measure the same.
>
>  But I found , though RTCP is not there voice is transmitterd clearly
> between endpoints.Then RTCP implementation is not necessary?
>
>  Thanks a  lot for the reply.
>
>
>  Thanks & Regards
>  Bincy K Philip
>
>  -----Original Message-----
>  From: Yusuf Mayet [mailto:jojo786 at gmail.com]
>  Sent: Thu 11/15/2007 12:31 AM
>  To: Bincy K. Philip
>  Subject: Re: [VOIPSEC] How QOS of VoIP call is measured
>
>
>  SIP and H323 use RTP as the Transport.  RTP is usually acompanied by
>  RTCP.  RTCP gives you things like jittter, delay, packet loss.
>
>  On Nov 14, 2007 1:36 PM, Bincy K. Philip <bincy.philip at nestgroup.net>
> wrote:
>  >
>  >
>  >
>  > Hello ,
>  >
>  > I need to know QOS measurement details of VoIP calls.
>  > For meauring QOS of a VoIP call using SIP or H.323, any additional
> protocol support have to add in the application.
>  > I mean, how the QOS measurement tools works and gives the QOS measured
> value.
>  > I got familiar with free tools like WinEyeQ  and VQmanager(only for
> SIP).In the same setup different applications/softphones gave different
> values.How it works?
>  >
>  >
>  > Thanks & Regards
>  > Bincy K Philip
>  >
>  >
>  > _______________________________________________
>  > Voipsec mailing list
>  > Voipsec at voipsa.org
>  > http://voipsa.org/mailman/listinfo/voipsec_voipsa.org
>  >
>
>
>
>  --
>
>  thanks,
>  Yusuf
>
>



-- 

thanks,
Yusuf