Make sure the remote phone is using a low bandwidth codec too. In a previous life changing a remote (home) user's phone from G.711 to G.729 made all the difference in the world to their call quality. Matthew Shaw – Sr. Network Administrator FairPoint Communications | mshaw@fairpoint.com www.FairPoint.com -----Original Message----- From: Brandon Galbraith [mailto:brandon.galbraith@gmail.com] Sent: Tuesday, August 06, 2013 12:11 PM To: Andy Ringsmuth Cc: NANOG list Subject: Re: Comcast contact Have you monitored your user's home Comcast connection with regards to packet loss or latency, preferably from network-near the SIP termination point? On Tue, Aug 6, 2013 at 10:56 AM, Andy Ringsmuth <andy@newslink.com> wrote:

Any chance someone on this list is affiliated with Comcast who could contact me off-list? I have an employee in Virginia who works from home using, in part, a VOIP desk telephone tied into our office phone system back in Nebraska. She's had nothing but problems maintaining a stable connection and I'm at my wit's end to diagnose and fix whatever is causing her problems.

I've got this exact setup with several employees around the country, but this one person is the only one who, 1 - has problems and 2 - has Comcast.

Much appreciated!

---- Andy Ringsmuth andy@newslink.com News Link – Manager Technology & Facilities 2201 Winthrop Rd., Lincoln, NE 68502-4158 (402) 475-6397 (402) 304-0083 cellular

_______________________________________________________________________ This e-mail message and its attachments are for the sole use of the intended recipients. They may contain confidential information, legally privileged information or other information subject to legal restrictions. If you are not the intended recipient of this message, please do not read, copy, use or disclose this message or its attachments, notify the sender by replying to this message and delete or destroy all copies of this message and attachments in all media.

I agree it's not a lot of bandwidth, but I was grasping at straws at that point finding out about the cross country VoIP arrangement after the fact. For whatever reason, the 711 calls were full of voice clipping and call drops, 729, (with to your point, the lower MOS) worked better as despite not sounding as good, the calls stopped dropping and people's voices were no longer dropping out. Matt -----Original Message----- From: Rob Seastrom [mailto:rs@seastrom.com] Sent: Tuesday, August 06, 2013 11:56 PM To: Shaw, Matthew Cc: Brandon Galbraith; Andy Ringsmuth; NANOG list Subject: Re: Comcast contact "Shaw, Matthew" <mshaw@fairpoint.com> writes:

Make sure the remote phone is using a low bandwidth codec too. In a previous life changing a remote (home) user's phone from G.711 to G.729 made all the difference in the world to their call quality.

i think you've got that backwards. 80 kbit/sec on the wire is not a lot these days, and in a world where we're conditioned to accept gsm or worse, un-transcoded g.711u sounds startlingly good. if you're so short on bandwidth that moving to a 24 kbit/sec on the wire codec makes a difference, you're on the ragged edge of being hosed. -r _______________________________________________________________________ This e-mail message and its attachments are for the sole use of the intended recipients. They may contain confidential information, legally privileged information or other information subject to legal restrictions. If you are not the intended recipient of this message, please do not read, copy, use or disclose this message or its attachments, notify the sender by replying to this message and delete or destroy all copies of this message and attachments in all media.

agreed this isn't the case based on what I've seen based on my latest former employer(s). Comcast is playing by the (generally agreed upon) rules. what I have been seeing is a lot of other route optimizations changing as other providers consolidate routing among latest acquisitions. And of course, there's always the defensive changes also based said changes. constant maintenance and optimizations in recognition of the contracts. it'll sort out, the questions are what's needed to force the issue and, of course, where the standouts end up. -R> On Wed, Aug 7, 2013 at 5:38 AM, Livingood, Jason < Jason_Livingood@cable.comcast.com> wrote:

...

I have found Comcast rate shapes or resets long running encrypted sessions such as https. At $DAYJOB I had to set our SSL VPN system to re-key via new-tunnels every 5 minutes to keep it under their threshold of what looks like seven minutes for a tcp session. After that the sessions appeared to rate shape down to 128kbps. It may also only kick in during local POP congestion. I am assuming this is DPI trying to do peer-2-peer mitigation.

We don't have such network practices and are required not to under Open Internet rules. I have no idea what was causing your VPN issue - I can use my corporate VPN for hours or days at a time with no issues. Happy to assist off list if you like.

Jason