[VoiceOps] SDWAN for VOIP
David.Hiers at cdk.com
Tue Oct 3 17:47:47 EDT 2017
The voice requirements that were used were pretty simple-sounding, something like:
1. Move a call multiple times between multiple links in response to multiple link failures without losing audio quality or signaling
2. Conceal up to 5% packet loss from SIP and RTP on a single link
3. Simultaneously meet requirements 1 and 2 for any combination of links
The requirements sound simple, but you folks know how hard it would be to implement something like this. We had other requirements to deal with our core application and data-center oddities, but those voice ones can pretty much stand alone.
In retrospect, we might have phrased #2 in terms of "MOS per unit loss". Something like "Calculated MOS score on a g.711 call can drop no more than 0.1 with 5% packet loss" would have been more measureable than a subjective 'can you hear me now' kind of opinion.
We wound up going with VeloCloud.
Best advice is to shoot for the moon on your requirements, and test the living daylights out of it.
Staying away from all the NDA-breaking geeky stuff, here are warning signs to keep an eye out for:
1. Vendors that don't let you run your own pilot. If they insist in being right there with you, their stuff isn't ready for production.
2. Over-reliance on fancypants graphs. Amazing graphs are great and all, but not even close to being as important as actually fixing problems.
3. Scoping assertions. One vendor asserts that "an SDWAN can only be as good as the underlay network" because they simply can't do error CORRECTION. If you buy off on their assertion, you're doomed.
4. Hiding behind "best effort". Can't tell you how many times we heard "oh, that feature is just best-effort, it might not work all the time" when we pressed them. For EVERY feature that is important, be sure that you nail them down what actually works 100% of the time and what they implement as some kind of throw-away 'best-effort' slideware feature.
From: Paul Stamoulis [mailto:paul at everestbroadband.com]
Sent: Tuesday, October 03, 2017 2:05 PM
To: Hiers, David <David.Hiers at cdk.com>; voiceops at voiceops.org
Subject: RE: SDWAN for VOIP
David, thanks for the info - we are currently looking at this technology as well for services to remote locations and redundancy of network - can you share which carrier you are using and with whom you are satisfied? Have you looked at any of the other carriers offering same? how about any other pros or cons between them?
Everest Broadband - Your Local Voice & Data Network Experts - we're always nearby
Paul Stamoulis 1 212 444 3003 www.EverestBroadband.com<https://urldefense.proofpoint.com/v2/url?u=http-3A__t.sidekickopen16.com_e1t_c_5_f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJW7t5XZs5w6vTbVdD-2DFY7dKXNRW8qlRZx56dLX3f4fbXk602-3Ft-3Dhttp-253A-252F-252Fwww.everestbroadband.com-252F-26si-3D5992006913097728-26pi-3D1d0f87e6-2Da797-2D43e8-2Db66d-2D034c045bc663&d=DwMFAg&c=N13-TaG7c-EYAiUNohBk74oLRjUiBTwVm-KSnr4bPSc&r=-GzOCp0ppLaBQPFaZ7lZ4bUUBQxpFBukitRP75oaRdQ&m=izAmTbT9C20gHgUDya0H06r8yOS8p-AXQJ_EmhcYpNo&s=AHhRpyMCK2g4uzsU0ecTvykfvAdUSEYkz4AqUJ6yXR4&e=>
for technical support: call 800-918-1900 option 1 email Tickets at EverestBroadband.com<mailto:Tickets at EverestBroadband.com>
From: VoiceOps [mailto:voiceops-bounces at voiceops.org] On Behalf Of Hiers, David
Sent: Tuesday, October 03, 2017 4:57 PM
To: voiceops at voiceops.org<mailto:voiceops at voiceops.org>
Subject: [VoiceOps] SDWAN for VOIP
Is anyone else using SDWAN for VOIP?
We can move a call between links and impose 10% packet loss and the users pretty much don't notice anything. No loss of call control or mid-call signaling, barely detectable impact on audio quality.
This is pretty much the only way we've found to deliver the quality that our (very demanding) customers require using a 'bring your own bandwidth' model.
It has been such a game-changer for us that I'm being sent to SIPNOC to give a talk about it.
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