[asterisk-users] Teliax Quality of Service

[John Meksavan]

Asterisk Users,

  In my setup, I have a T1 service with McleodUSA and I am using the SIP 
protocol.  I am  considering switching back to analog lines because quality 
of service outweighs the cost savings at my work.

  Any good SIP providers out there?




>From: "Baji Panchumarti" <baji.panchumarti at gmail.com>
>Reply-To: Baji.Panchumarti at gmail.com,Asterisk Users Mailing List - 
>Non-Commercial Discussion<asterisk-users at lists.digium.com>
>To: asterisk-users at lists.digium.com
>Subject: Re: [asterisk-users] Teliax Quality of Service
>Date: Thu, 2 Aug 2007 16:40:27 -0400
>
>   On 8/2/07, John Meksavan  wrote:
>
> > Asterisk Users,
> >
> > I recently ran into some problems with the quality of service with 
>Teliax.
> > This occurred on August 1, 2007 with a dropped outbound call, audio
> > quality isse on the callee side- not hearing me well on callee side, and
> > sending DTMF tones (configured for RFC2833).  Am I the only Teliax
> > customer having this problem?
>
>  ditto here this week, random breaks in audio, garbled voice etc.
>
>  My softphones dialing in from outside had no audio issues. Others
>  on teliax forums suggested I switch to SIP since iax2 is aggressively
>  evolving and teliax equipment is experiencing some incompatibilities
>  with recent * iax releases.
>
>  I changed codecs from gsm to ulaw, voice quality improved but same
>  random breaks.
>
> > It seems like when I am ready to go live with my Asterisk PBX System, I
> > run into quality of service issues with the SIP provider.
>
>  Consider having some fall back options from alternate providers since
>  it doesn't cost a whole lot to keep an active account.
>
> > Who should I go with that would guarantee me quality service just like
> > an analog line?
>
>  I have heard that there is no such thing unless your provider & you have
>  a dedicated, or at least highly reliable, circuit between the two of you 
>:
>
>       http://en.wikipedia.org/wiki/User_Datagram_Protocol
>
>   "UDP does not guarantee reliability or ordering in the way that TCP 
>does.
>    Datagrams may arrive out of order, appear duplicated, or go missing
>    without notice. Avoiding the overhead of checking whether every
>    packet actually arrived makes UDP faster and more efficient, at least
>    for applications that do not need guaranteed delivery. Time-sensitive
>    applications often use UDP because dropped packets are preferable
>    to delayed packets..."
>
>   One of the reasons Time Warner, Armstrong, Cox and other cable
>   broadband guys are able to offer fairly reliable voip service is that
>   they control the pipes between their VoIP proxies and their end
>   users.
>
>   It is also the reason vonage, teliax and other 3rd party vendors
>   have more issues. I used broadvox a few years ago, if the callee
>   answered before the caller had heard a ring the line went dead :-)
>
>   -baji.
>
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