[182508] in North American Network Operators' Group
Re: SIP trunking providers
daemon@ATHENA.MIT.EDU (Rafael Possamai)
Mon Jul 20 11:21:53 2015
X-Original-To: nanog@nanog.org
In-Reply-To: <9578293AE169674F9A048B2BC9A081B401C70ABA80@MUNPRDMBXA1.medline.com>
From: Rafael Possamai <rafael@gav.ufsc.br>
Date: Mon, 20 Jul 2015 10:21:28 -0500
To: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
When I originally posted the thread, I had asked Chicago due to physical
proximity, and my assumption being the lesser the number of hops, the lower
the probability of running into issues (latency, jitter and congestion). On
the other hand, one of my sandboxes are out of Las Vegas and I haven't had
any issues yet, but the number of test calls I've ran aren't enough to say
with confidence that distance and hops don't matter (indirect ways of
measuring latency, etc).
Another thing is, having your packets stay in Chicago and in Chicago only
is a nice thing, the efficiency of your overall system would be higher for
what it's worth, but as an example, the 2nd hop this e-mail is taking to
get delivered to Nanog is about 100 miles, who knows about the other ones.
On Mon, Jul 20, 2015 at 8:49 AM, Naslund, Steve <SNaslund@medline.com>
wrote:
> End to end delay is not the most limiting factor. Jitter is the issue an=
d
> packet drops are the other issue that matters (more importantly the
> distribution of drops). I think the best reason to select the local
> provider over the distant one is that the sooner he gets off the IP netwo=
rk
> the less impairments he will run into. The TDM network as antiquated as =
it
> is, is less susceptible to congestion and call impairments than an IP
> backbone network is. I can tell you from running a bunch of Internationa=
l
> VOIP networks that they are just not as reliable as TDM. The average
> internet connection just does not meet the reliability standards that the
> TDM voice network has achieved. IP networks are affected by congestion a=
nd
> routing issues whereas the TDM network seldom has these type of problems.
> An outage on a TDM circuit rarely affects other TDM circuits so they see =
a
> lot less higher level outages. I can understand why he does not want to
> haul his voice cross country over IP when he is exiting locally most of t=
he
> time.
>
> Yes, I understand that the carrier might very well be hauling that traffi=
c
> via IP even after he gets to his gateway point but at that point it becom=
es
> their problem to deal with.
>
> Steven Naslund
> Chicago IL
>
>
> >If you=E2=80=99re going to the PSTN, who gives a shit where you do the
> interconnect as long as its within 100ms.
> >
> >If most of your calls are VOIP<->VOIP within Chicago, then it makes some
> sense to set up a box and just send the external calls out to the trunkin=
g
> provider where >you no longer really care where they are.
> >
> >Absent significant network suckage, there=E2=80=99s no place in the con=
tiguous
> US that isn=E2=80=99t within 100 ms of any other place in the contiguous =
US these
> days.
> >
> >Owen
>
>
