[VoIP] CNET Internet Telephony Administrative Domain

[John R. Covert]

I think that we should consider getting CNET (i.e. either Greg or
I should apply for) an ITAD (RFC 3219 Internet Telephony Administrative
Domain) which would enable ingress with ISN (Internet Subscriber
Number) format dialing -- <org-access-code>CNET-Number*<itad># --
from many university campuses and companies.  The "org-access-code"
is typically "012", "8012", "*0" (MIT), or some other local assignment.

For example, my ITAD is 288 (yes, the luck of the draw got me 288), so
my CNET gateway is available from MIT by dialling *0 (pause) CNET * ATT #
(that's *0,2638*288#).

The pause is required at MIT because there seemed to be absolutely
no way to make a #5ESS collect <access-code><digits>*<digits>#
The combination of the "*" in the middle and variable length
digit fields could not be handled, requiring the use of "*0"
(actually a speed dial code for a "secret" number) which cuts
through to an Asterisk instance which does the digit collection.

I use "8012" from my PBX because my dialplan uses 8xxx for special
service codes.  "012" is recommended, because the folks who dreamed
this up thought that was an available prefix generally, knowing about
"011+" (overseas sent-paid), not considering "01+" (overseas op-assist).

It's "**012" from Free World Dialup.  So CNET would become accessible
from FWD as **012 <CNET-number> * <our-ITAD> #

The list of ITAD enabled organizations is at
http://www.iana.org/assignments/trip-parameters

Not every ITAD enabled organization is participating in ISN dialling.
Those that are have a quasi-enum-style DNS entry of *.<ITAD>.freenum.org
which can either direct all calls to a single gateway or which could
be a delegation of that portion of the namespace to another DNS server
which could send things directly to individual CNET switches IFF they
are capable of accepting SIP as well as IAX calls.  (IAX entries
could be in the database, but there is no guarantee that an ISN
originating switch can handle IAX.)

/john