On Wednesday 10 October 2012, Mitch Claborn wrote:
> I am a complete novice at T1's, etc. What else besides framing and
> coding do I need to ask about?
Ask how numbers come through on incoming calls: in "international" format
(with IDD and STD codes, but without the leading double-zero and zero
respectively); in "full national" format (with STD code including the
leading zero); in "national" format with the STD code *but* with the leading
0 stripped; or just the local number.
Also ask how they want you to send numbers on outgoing calls (in particular,
do you need to insert the STD code even for a local call?)
Then, don't believe a word they say; and use something like
exten => s,1,NoOp(Call to ${EXTEN})
to see how they are _actually_ sending numbers to you. Start out by sending
your numbers in the same format, but don't expect consistency.
Usually, channels 1-15 and 17-31 are B-channels and 16 is the D-channel; but
again, check this with the telco. If your box can't find a D-channel, it won't
work at all.
--
AJS
Answers come *after* questions.
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