Steve wrote:
Speaking from T1 PRI and E1 PRI in West Africa, you tell the telco how many
digits to send. Often times, at least in my experience, if not specified, they
will only send the last four providing there are no conflicts.
They should be able to send however many digits you require, but maybe they
wont.
I have found that each telco, and in fact each CO, may have a different
practice for how many
digits they send. If you have a good sales person when you place the order you
can specify, or
at least they will provide that information. If you have an uninformed sales
person, the engineer
who sets up you circuit can usually provide that. If you end up with
uninformed sales and engineering
personnel, then it is time to test and debug.
After dealing with telcos in China, Korea, Taiwan, Japan, India, Israel,
Germany, The Netherlands and
the USA, I have found *1* telco that provided all of the circuit details in
advance without asking. Most
will tell you they are using the standard values, but have no idea what those
values are.
Here is my check-list I ask for on new orders-
Linecoding (If E1 I also ask if G.703
or not)
Framing
Switchtype
Digits sent/outpulsed
Digits expected (City or local code required?)
Some telcos have been willing to change the number of digits sent, but I
usually just
rewrite the received number to prepend the missing digits. It is a little more
work for
me, but it reduces the chance that future maintenance by the telco will revert
the
circuit back to their normal values and bust inbound calls.
Dan
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