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Cellular forums Home > Archive > T-Mobile cellular service > November 2006 > How'd they do that...
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How'd they do that...
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| Steven J. Sobol 2006-11-04, 10:33 pm |
| Because right now we only have one phone hooked up here at the house, I
forwarded my calls to my cell. A call just came in, and my PEBL displayed
the incoming number *and* indicated that the call was forwarded! Pretty cool,
but I'm wondering how that works - I wasn't even aware the telco passes that
info to the phone being called.
(by "that info", I mean any indication that the call is being forwarded)
--
Steve Sobol, Professional Geek ** Java/VB/VC/PHP/Perl ** Linux/*BSD/Windows
Victorville, California PGP:0xE3AE35ED
It's all fun and games until someone starts a bonfire in the living room.
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| Dennis Ferguson 2006-11-04, 10:33 pm |
| On 2006-11-05, Steven J. Sobol <sjsobol@JustThe.net> wrote:
> Because right now we only have one phone hooked up here at the house, I
> forwarded my calls to my cell. A call just came in, and my PEBL displayed
> the incoming number *and* indicated that the call was forwarded! Pretty cool,
> but I'm wondering how that works - I wasn't even aware the telco passes that
> info to the phone being called.
>
> (by "that info", I mean any indication that the call is being forwarded)
With Signalling System 7 the last switch gets a bunch of numbers along
with the call. A quick google didn't produce anything useful, but
from memory I think this includes the caller's number, the current called
number, the last number from which the call was forwarded (if any) and
the original called number (if different from the prior numbers), along
with a count of the times the call was forwarded (to prevent loops) and
the reason for the last forward (e.g. phone busy, not answered,...).
How the information gets from the last switch to the phone I don't
know, but the last switch certainly knows the call was forwarded and
both the first and last numbers from which it was forwarded. Note
that this is the same information that voice mail systems get when the
call is forwarded their way so they can figure out which mail box to
send the call to.
Dennis Ferguson
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| Dr. Joel M. Hoffman 2006-11-20, 10:33 am |
| >Because right now we only have one phone hooked up here at the house, I
>forwarded my calls to my cell. A call just came in, and my PEBL displayed
>the incoming number *and* indicated that the call was forwarded! Pretty cool,
>but I'm wondering how that works - I wasn't even aware the telco passes that
>info to the phone being called.
GSM does, and it's a really good idea. Otherwise, think what happens
if number A is forwarded to B, and B is forwarded to A....
-Joel
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