[182549] in North American Network Operators' Group
Re: SIP trunking providers
daemon@ATHENA.MIT.EDU (Curtis Maurand)
Tue Jul 21 08:06:51 2015
X-Original-To: nanog@nanog.org
To: nanog@nanog.org
From: Curtis Maurand <cmaurand@xyonet.com>
Date: Tue, 21 Jul 2015 08:06:33 -0400
In-Reply-To: <188E7B5B-4D13-4D87-A544-436CC8AE1E6C@delong.com>
Errors-To: nanog-bounces@nanog.org
That may be true of metro areas, but in rural USA there's plenty of TDM=20
to go around. Telco's are still delivering broadband on ADSL and phone=20
on TDM. Worse those trunked circuits are TDM over HDSL. In many rural=20
areas, there's not even ADSL or cable and that's within 40 miles of a=20
small city.
--Curtis
On 7/20/2015 5:33 PM, Owen DeLong wrote:
> 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 rapid=
ly becoming as popular as a Strowger.
>
> Owen
>
>> On Jul 20, 2015, at 06:49 , Naslund, Steve <SNaslund@medline.com> wrot=
e:
>>
>> 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 prov=
ider over the distant one is that the sooner he gets off the IP network t=
he less impairments he will run into. The TDM network as antiquated as i=
t is, is less susceptible to congestion and call impairments than an IP b=
ackbone 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 in=
ternet connection just does not meet the reliability standards that the T=
DM voice network has achieved. IP networks are affected by congestion an=
d routing issues whereas the TDM network seldom has these type of problem=
s. 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 wa=
nt to haul his voice cross country over IP when he is exiting locally mos=
t of the time.
>>
>> Yes, I understand that the carrier might very well be hauling that tra=
ffic via IP even after he gets to his gateway point but at that point it =
becomes 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 th=
e interconnect as long as its within 100ms.
>>>
>>> If most of your calls are VOIP<->VOIP within Chicago, then it makes s=
ome sense to set up a box and just send the external calls out to the tru=
nking provider where >you no longer really care where they are.
>>>
>>> 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.
>>>
>>> Owen
--=20
Best Regards
Curtis Maurand
Principal
Xyonet Web Hosting
mailto:cmaurand@xyonet.com
http://www.xyonet.com
