[Asterisk-Users] VoIP over 1xRTT

[Michael Giagnocavo]

I'm using an EV-DO modem here in Guatemala, but I see that the ping times
are ~200-400ms to the ISPs machines (i.e., the first hop is most of the
time). Some people are a bit less (say ~100-200ms). Is this normal, or is
the ISP screwed up (as usual)?

-Michael

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Brian
McSpadden
Sent: Monday, October 18, 2004 3:45 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] VoIP over 1xRTT

It is not always the bandwidth, you are correct. There are however
times on the Sprint network that the bandwidth is reduced, or the
bandwidth is zero, because it can't connect to anything because the
network is so busy. WIth Sprint's CDMA 1xRTT network, voice and data
share the same network, but voice is the bread and butter of the
business, so it will get priority over data.

This is why I'm saying, EV-DO (and later EV-DV) will do great things
for VoIP over cellular networks. EV-DO (DO stands for Data Only),
dedicates a high speed data network, more available bandwidth for
everybody, and less latency, hence less jitter. I'm excited to see
these developments, as I believe it will make VoIP more reliable over
these types of networks. At the moment, there are simply too many
variables to trust it.

Brian


On Mon, 18 Oct 2004 17:36:14 -0400, Deon Rodden <drodden at webunited.net>
wrote:
> It's not the bandwidth. I have Sprint and am switching to Verizon with a
> week. When I go online through my Sprint phone, I get 250+ms response
times.
> That can not be VOIP friendly. I have clocked downloads at up to 130 kbits
> per second, so the speed is ok, but the ping response times are bad.
> 
> I've heard reports from Verizon users who get an average of 60-80 kbits
per
> second, so I 'feel' Sprint's network may be a little faster as their
average
> is higher, at least in my area. But Verizon is already doing the 2nd stage
> rollout, which is nice and fast.
> 
> But the latency issue will probably still be there, for Sprint or Verizon.
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