[Standards] updated STUN discovery proposal

[Richard Dobson]

>> What happened to disco items/info ?
>>     
>
> If the list of STUN servers is provided via disco#items then you'd have
> to poll for updates, which seems undesirable.
>   
Would it not be better to have a push mechanism in disco to alert you of 
updates? Looking back it doesn't seem to have one, but I could swear 
that it used to, maybe I was seeing things :)

Richard