[77978] in North American Network Operators' Group
RE: Vonage complains about VoIP-blocking
daemon@ATHENA.MIT.EDU (Nathan Allen Stratton)
Tue Feb 15 17:21:20 2005
Date: Tue, 15 Feb 2005 17:18:14 -0500 (EST)
From: Nathan Allen Stratton <nathan@robotics.net>
To: Jay Hennigan <jay@west.net>
Cc: "Hannigan, Martin" <hannigan@verisign.com>,
"'Eric Gauthier'" <eric@roxanne.org>, nanog@merit.edu
In-Reply-To: <Pine.LNX.4.58.0502151403370.17853@ohtf.fo.jrfg.arg>
Errors-To: owner-nanog-outgoing@merit.edu
On Tue, 15 Feb 2005, Jay Hennigan wrote:
> Vonage devices initiate an outbound TFTP connection back to Vonage to
> snarf their configs on initial connection and also (presumably) on reboot.
>
> Many, many VoIP devices do this, including Cisco phones in all major
> flavors. If an ISP is blocking TFTP originated by its customers at the
> border, this will cause numerous problems with many VoIP devices as
> well as numerous other things where a customer needs to initiate a TFTP
> session over the Internet.
>
> Filtering customer-initiated TFTP will cause problems with many legitimate
> applications and devices.
Most devices have moved to http config, sipura, snom, panasonic, etc. We
moved away from tftp because of a lot of NAT and blocking issues. As far
as SIP, I don't see it as a major problem since you can use any port.
><>
Nathan Stratton BroadVoice, Inc.
nathan at robotics.net Talk IS Cheap
http://www.robotics.net http://www.broadvoice.com
