SIP trunking providers

Tue Jul 21 04:53:09 UTC 2015

Okay, fair enough.  I guess I made the assumption somehow that Mike was concerned solely about latency, which if that's all he is concerned about, then the points you bring up would largely be strawmen.  But I just re-read Mike's post, and he doesn't state his reasons for wanting the local gateway.  It must have been Dovid's reply that planted the seed of the idea in my mind that Mike was primarily concerned about latency.

-- Nathan

________________________________________
From: NANOG [nanog-bounces at nanog.org] On Behalf Of Naslund, Steve [SNaslund at medline.com]
Sent: Monday, July 20, 2015 6:49 AM
To: nanog at nanog.org
Subject: RE: SIP trunking providers

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.

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.

Steven Naslund
Chicago IL

>If you’re 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 trunking provider where >you no longer really care where they are.
>
>Absent significant network  suckage, there’s no place in the contiguous US that isn’t within 100 ms of any other place in the contiguous US these days.
>
>Owen