To connect to an ISDN line you dial the 7-10 digit
phone number just like an analog call.
Your 7 digit phone number is the "ldn" local directory number.
Local meaning local to your exchange. (i.e. no area code)
You would tack on the area code if dialing from out of your exchange area.
The SPID "Service Profile Identifier" is a local designation that
is significant between the ISDN switch you are connected to and
the device at the other end of the BRI line.
Since the ISDN BRI spec allows for up to 8, although rarely implemented,
separate devices each with a different service profile,
i.e. feature capabiility, the switch needs to be able to determine
what device to send to and what device is sending information.
You can probably think of a SPID acting like the DLCI on a frame relay link.
The SPID can be any number that is locally unique, but
the phone number, and a few extra digits, that the is associated with
the line is usally used to make things easier to track since most
phone company billing systems are telephone number centric.
Hope this helps...
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=19802&t=19752
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