[182532] in North American Network Operators' Group
Re: SIP trunking providers
daemon@ATHENA.MIT.EDU (Owen DeLong)
Mon Jul 20 17:35:17 2015
X-Original-To: nanog@nanog.org
From: Owen DeLong <owen@delong.com>
In-Reply-To: <9578293AE169674F9A048B2BC9A081B401C70ABA80@MUNPRDMBXA1.medline.com>
Date: Mon, 20 Jul 2015 14:33:41 -0700
To: "Naslund, Steve" <SNaslund@medline.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
The TDM network is rapidly being eliminated. The major telcos have been =
moving their backbones to VOIP and higher levels of oversubscription as =
a result for years now because of the very large cost savings that can =
be achieved.
International TDM may still be pretty common, but domestic TDM is =
rapidly becoming as popular as a Strowger.
Owen
> On Jul 20, 2015, at 06:49 , Naslund, Steve <SNaslund@medline.com> =
wrote:
>=20
> End to end delay is not the most limiting factor. Jitter is the issue =
and 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 =
network 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 International 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 and 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 the time.
>=20
> Yes, I understand that the carrier might very well be hauling that =
traffic via IP even after he gets to his gateway point but at that point =
it becomes their problem to deal with.=20
>=20
> Steven Naslund
> Chicago IL
>=20
>=20
>> If you=E2=80=99re going to the PSTN, who gives a shit where you do =
the interconnect as long as its within 100ms.
>>=20
>> 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 =
trunking provider where >you no longer really care where they are.
>>=20
>> Absent significant network suckage, there=E2=80=99s no place in the =
contiguous US that isn=E2=80=99t within 100 ms of any other place in the =
contiguous US these days.
>>=20
>> Owen
>=20
