Based on what we have seen.... # 1. Yes having better connectivity to is a given must, having the ability to change routes via multiple inbound IP Transit peers is a pre-requisite for this. # 2. Not sure about this, it is more likely to break stuff than reduce exposure to packet drop. # 3. I would say this differently ,( see below). Our Experience are as follows:- ..... Avoid Messing with the MEDIA, as much as possible.... Less number of Codec Conversions the better the quality. Packet Loss is always a big culprit, but identifying the source of it is a bit more challenging than doing the face value troubleshooting. (Source of Media can be different than the perceived ITSP's network .... ) And using devices on the Edge (customer premises, facing the provider), it is very important to have devices that will respect the DSCP/TOS tags and follow them..... Lots of device do a good job of it, and many other don't. (There is no correlation on less expensive device is not as good as a more expensive device). The key to good quality Audio is.... Avoid Congested Network Paths. Avoid Media Conversion / Codec Conversions ... Avoid packet drops at Customer Edge. It is rather simple, but gets complicated in tracking down the source of the problem... Which becomes a whole different topic ! Regards. Faisal Imtiaz Snappy Internet & Telecom ----- Original Message -----
From: "Mark R Lindsey" <lindsey at e-c-group.com> To: voiceops at voiceops.org Sent: Monday, June 9, 2014 2:50:57 PM Subject: [VoiceOps] High Quality, Reliable Voice via the Internet / SIPNOC
At SIPNOC this week, we're having a "Birds of a Feather" session on delivering quality voice services across the public Internet.
A few techniques to make voice across the Internet better:
1. For packets from the ITSP to the customer: override the default BGP routing to choose an alternate route
2. Increase the ptime from 20 ms to 30-40 ms to reduce packet-drop exposure
3. EdgeWater brings us this one: actively manage TCP streams from Internet to CPE to provide better quality for Voice.
So what OTHER techniques are there? Which techniques don't work?
Yeah, it's the Internet. It's going to have failures. You're going to have bad days. But surely there are ways to improve the odds.
mark at ecg.co +1-229-316-0013 http://ecg.co/lindsey
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