[asterisk-users] Is it possible to get full callin number fromE1?

[Dan Austin]

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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