[VoiceOps] High Quality, Reliable Voice via the Internet / SIPNOC

[Brandon Lehmann]

>>  1. For packets from the ITSP to the customer: override the default BGP routing to choose an alternate route

>Interesting idea. Who's doing this and how is it working for you? Are you using static routes or altering BGP? Other?

 

At my full time job we see a measurable difference in MOS based upon the routing preferences out of and in to our AS…  I can’t count how many times a simple change in routing policy has improved perceived quality. This is one of the many reasons my office stresses carrier diversity.

 

 

 

From: VoiceOps [mailto:voiceops-bounces at voiceops.org] On Behalf Of PE
Sent: Monday, June 09, 2014 5:30 PM
To: Mark R Lindsey
Cc: voiceops at voiceops.org
Subject: Re: [VoiceOps] High Quality, Reliable Voice via the Internet / SIPNOC

 

>  1. For packets from the ITSP to the customer: override the default BGP routing to choose an alternate route

Interesting idea. Who's doing this and how is it working for you? Are you using static routes or altering BGP? Other?

 

>  2. Increase the ptime from 20 ms to 30-40 ms to reduce packet-drop exposure

Alex B may be right on this. Hard to speculate without hard evidence with lots of volume to back it up. I do know, however, that some carriers (Verizon comes to mind) will not support anything other than 20ms, so it is easier to standardize on a single ptime rather than try to customize each install.

 

>  3. EdgeWater brings us this one: actively manage TCP streams from Internet to CPE to provide better quality for Voice.

Are they suggesting SIP over TCP or some other out-of-band TCP to help manage quality to the endpoint. While we have a small amount of SIP/TCP going on to support older BLF integrations, I am not a fan. It adds overhead to the core (SBC) and also means that an SBC switch from active to standby will drop the device.

 

 

 

On Mon, Jun 9, 2014 at 2:50 PM, Mark R Lindsey <lindsey at e-c-group.com> wrote:

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 <tel:%2B1-229-316-0013>  http://ecg.co/lindsey


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