At 21:08 -0700 4/13/03, Hallam-Baker, Phillip wrote:
The telcos do not guarantee to connect every call. They certainly would not
connect calls with fake caller id.
The tellcos are within their rights to drop calls in three circumstances.
First their network is overloaded. Second their customer asks them to. Third
the call has fake connection data.
Points of order:
Carriers do not test "caller ID" and they don't always know what it should be.
They certainly can and will pass fake CNID.
For example, when a call originates in a PBX, the CNID data is generated at the
(private) PBX and the carrier has no involvement.
There is a possible hack for non-PBX points of origin that involves blasting a
caller ID across the circuit once it's completed (it's just fancy
modem-style tones),
in the hope that the CNID receiver at the other end will hear your ID
and update
its display. Post-connection traffic is not of interest to the
switchgear, so there
won't be monitoring there. Caller ID boxes with memories should be
able to display
both received numbers anyway.
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