What vexes VoIP users?

Frank Bulk frnkblk at iname.com
Wed Mar 2 10:26:40 CST 2011

Thanks for clarifying.  I can't imagine an MSO using separate DS and US QAMs for their eMTAs.  Regardless, the customer's Internet would flow over those same QAMs (unless it was a D3 channel-bonding eMTA, and even then I'm not sure if the CMTS could be provisioned to use one QAM for voice and the remaining QAMs for data).


-----Original Message-----
From: Scott Helms [mailto:khelms at ispalliance.net] 
Sent: Wednesday, March 02, 2011 9:27 AM
To: frnkblk at iname.com
Cc: nanog at nanog.org
Subject: Re: What vexes VoIP users?


     No, not all.  There seems to be some confusion here between the 
concept of PacketCable flows which everyone _should_ (but aren't) be 
using to prioritize their voice traffic and separate downstream and 
upstream channels which a few operators use for voice traffic only.

On 3/2/2011 12:55 AM, Frank Bulk wrote:
> Scott:
> Are you saying that the large MSOs don't use CM configuration files that create separate downstream and upstream service flows for Internet, voice signaling, and voice bearer traffic?
> Frank

Scott Helms
Vice President of Technology
ISP Alliance, Inc. DBA ZCorum
(678) 507-5000

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