When a call arrives for any number in my DID block, telco seizes one of
the DID trunks assigned to me. I acknowledge the seizure and my readiness
to accept digits by sending a wink. Telco then outpulses the final dialed
digits to me via DTMF. For example, if the caller dialed 555-1147, telco
would outpulse "147" in DTMF. This way, if the DID trunks terminated on a
PBX, the PBX could route the call to the appropriate extension based on
the number that the caller dialed (in the above example, extension 147).
When the call is answered, my equipment seizes the trunk, and releases it
when the call is disconnected. The original intent of DID was to allow a
large number of dialable numbers to be uniquely identified and routed over
a small number of trunks. DID is also popular with paging and voicemail
companies, answering bureaus, etc.
I am familiar with this signaling and have used it in the PBX environment.
It is *NOT* the same as regular "inbound-only" trunks, although telco
marketing droids continue to confuse the two.
Telco here is proposing DID trunk signaling for use with PM-3 for inbound
modem usage.
My questions are as follows:
Will the PM-3 work at all with true DID trunks configured as described
above?
If so, is there a means of passing the actual dialed digits that the
telco sends as part of the setup to RADIUS or otherwise handling the
incoming call differently based on the DTMF digits passed by the telco?
Anyone actually doing this?
-- Jay Hennigan jay@west.net --
WestNet: Internet service to Santa Barbara, Ventura and the world.
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