Elliott Jeyaseelan wrote:
Hello All,
Need some advice and what to look out when setting up a PRI.
I have configured asterisk with analog lines before.
Helping a friend with setting up asterisk with an Allstream PRI line,
going with Sangoma A101d with hw echo-canceller.
Anyone care to shed some light on what the following is, this is from
the AS PRI request form:
-Trunk Selection Sequence
You will use descending sequential (for outgoing), they should use
ascending sequential (for incoming)
-Hunt Group, Virtual Group
You shouldn't need these, unless you have complex traffic requirements.
Generally this can be controlled in asterisk, which is a much better way
to handle it.
-External Name & Number Display (does this mean I can set my own name
and number on the fly)
You'll probably want to be able to control it on outgoing, although that
also means you'll need to handle that in asterisk.
-Digit Substitution required
None. You want them to send DNIS (the number that was dialed; i.e. the
DID number).
-Backup D required (y/n)
No. You can only use this if you have more than one T1 providing the
PRI, and also, with Astersk, you're better off with multiple D-channel
control if you have more than one T1 (it's easier to configure).
-Line coding & framing (I think this is B8zs/esf)
Correct
-ISDN protocol (I think this is NI-2)
Correct. DMS100 is fine too.
-Release line trunking (Allstream says it's a $75 charge)
Probably 'no'. If you are doing a lot of external transfers, this may
reduce trunk usage, but then you lose control of the call, so won't be
able to do CDR on it. Also, I'm not sure if Asterisk handles this
correctly yet.
-Digits to outpulse
DNIS - 10 digits.
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Jim Van Meggelen
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http://www.oreillynet.com/pub/au/2177
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