RE: Vonage complains about VoIP-blocking

["Michael Hallgren" <m.hallgren () free fr>]

> > Was that a device trying to phone home and get it's configs?
> > Cisco, Nortel, etc. phone home and get configs via tftp.
> >
> > Vonage doesn't need to phone home for config. The device is 
> programmed 
> > (router) and it registers with the call manager.
> > If you analyze the transactions it's about 89% SIP and 11% SDP.
>
> 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.

Consequently, should "unlikely or most likely not :)" be filtered 
by (I|N)SP, IMHO. Who's (still) using TFTP for fragile tasks...?

Cheers, 

mh


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> Jay Hennigan - CCIE #7880 - Network Administration - jay () west net
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