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If you have point-to-point (PTP) ISDN then you may only connect one ISDN device - the PBX - to the S0 bus. In this case the phone numbers are called DDI instead of MSN (point-to-multipoint, PTMP). Other known marketing names are "indialing" for DDI, which usually provides sets of 10 consecutive numbers.

DDI and DID have the same meaning (direct inward dialing).

Term translation into German

PTP: "TK-Anlagenanschluss" (comes with a "NTBIBA")
PTMP: "Mehrgeraeteanschluss" (comes with a "NTBA")
BRI: 2-Kanal ISDN ("ISDN Standardanschluss")
PRI: x-Kanal ISDN (usually 28-30 channels)

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Re: Seeking info or advice about Call Monitoring/Recording
by bcnit Mon 08 of Sep, 2008
Quite simply, what you are suggesting won't work.

The PBX needs to have one FXS port (into which you would plug the regular phone) and one FXO port (which then plugs into the POTS line to the outside).
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Interconnect A party & B party (SS7, ISDN, VoIP)
by picaso Sat 06 of Sep, 2008
Dear Sir,

I have to interconnect A party and B party for direct route.
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Seeking info or advice about Call Monitoring/Recording
by heirrook Fri 05 of Sep, 2008
What I need to do is record telephone calls that are made on regular phones on a regular telephone line, and record the calls somehow using a VoIP system.

I wish to use this system using a PBX and VoIP phone adapters without using an actual VoIP external line. The line that comes into my house is a POTS line. The setup does not look like it will work to me, but I have seen this exact setup where I work so I am very confident that it does work. I wish to do it like this:
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