kent@uunet.uu.net (Kent Hauser) (07/10/89)
I am currently trying to devise a method of reconfiguring a network
which is physically in the US but is connected to the AT&T
International gateways in New York City and Sacramento. I'm having
trouble getting technical info from AT&T and hoped some of you might
know about AT&T's int'l system.
Currently, the networks connect on the Int'l side of the AT&T gateways
and use CCITT No. 5 signalling. This arrangement was fine when the
inital connections were established since the switch and tranmission
facilities were analog.
However, now there are digital facilities connected directly with the
gateways & we have a digital switch being procured. Unfortunately the
new switch doesn't support No. 5 so the choice is to install a channel
bank & signalling converters to convert from R1. This seems silly.
The word from AT&T is that inbound they *use* KP1/KP2 to determine if a call
is terminal or transit (I guess that's so they won't have to reprogram
if country code `1' is reassigned :=). This of course is not standard R1,
but hopefully we can hack this.
The more troublesome problem is AT&T claims that outbound, there is no
way to configure the gateways to generate R1 line signalling on the
international side.. The only choices seem to be CCITT No 5, 6, and 7.
(None of which are found on your basic toll switch.) This problem does
not seem to be easily solved, unless of course the information is incorrect.
This is what I am hoping.
For what it's worth, there are multiple 3-digit country codes involved,
and either 7 or 8 national digits. There is also an analogous problem
with the connections to Teleglobe's gateways in Montreal & Vancouver,
but we're not having so much trouble getting help solving them.
Help/pointers/contacts/info appreciated.
--
Kent Hauser {sun!sundc,uunet!cucstud}!tfd!kent
Twenty-First Designs kent@tfd.uucp