SIP in higher education

[Duane <>]

William Caban wrote:
> I just came across this draft and I don't remember a mention about it 
> before. Probably it will be a good protocol/specification/draft to 
> explore for SIPedu peering and identify the protocol extensions that 
> might be in common with SIPedu or that might help the adoption of SIPedu 
> outside a research network.
>
> Distributed Universal Number Discovery (DUNDi)
> http://www.dundi.com/dundi.txt

Dundi is often confusingly promoted as to it's real benefits (and it's 
downfalls), mainly it's key benefit is a corp lan running a couple of 
asterisk boxes that they don't care about vendor lock-in... Enum.164 
won't lock you to any vendor and is already widely supported, IAX is 
another open protocol that very few things support, and it's unlikely to 
be picked up by the cisco's of the world any time soon...

Dundi is no better then internal enum, except it locks you in to only 
using asterisk boxes, so anyone with cisco etc kit won't be able to make 
use of it out of the box, you'd have to proxy via an asterisk box (which 
would be self defeating)... Cisco etc can usually talk enum out of the 
box...

Dundi could have potential issues with scaling, as the more boxes used 
to add routing to the network increases and each box in turn is searched 
it could cause increasingly long wait times to find routes... Enum.164 
because of the efficiencies of DNS won't suffer scalability issues, just 
add more servers basically...

Dundi is an explicit trust system, you either trust it or you don't, and 
any boxes you trust, have the ability to inject routes they don't own... 
While Enum.164 can also be this way if NS records are delegated willy 
nilly, more often then not it's a more highly controlled system of who 
has access to what...

--

Best regards,
 Duane

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