It is possible however not in the same way that IP address spoofing is.
ISDN/PSTN calls use out of band signalling to establish communications.
This means that there are totally seperate networks for actual voice traffic
and call signalling. The signalling network utilizes the System Signalling
7 (SS7) protocol suite. It is in the signalling network where caller ID
information is transmitted specifically in the ISDN User Part Initial
Address Message (ISUP IAM) which is sent to initiate a call accross the SS7
network. To answer your question, though I don't know exactly how one would
go upon manipulating the caller ID information contained in an ISUP IAM, it
is certainly possible to hack SS7. You would need access to a Signalling
Point (SP SS7 connection, usually a PBX) as this is where the SS7 network is
terminated, not at the local loop.
HTH,
-Mike Cohen
-----Original Message-----
From: Bruce Moran [mailto:[EMAIL PROTECTED]]
Sent: Thursday, May 25, 2000 6:44 AM
To: Cisco Group Study
Subject: Re: ISDN caller ID
can anybody answer this one? I am curious as to the answer myself.
----- Original Message -----
From: Cisco Wave <[EMAIL PROTECTED]>
To: Cisco Group Study <[EMAIL PROTECTED]>
Sent: Wednesday, May 24, 2000 7:17 PM
Subject: ISDN caller ID
> Hello There,
>
> Is it possible to spoof the ISDN caller ID, like
> spoofing an IP address ?
> I mean rewriting some part of the stack, and having
> the caller ID set as wished ? Or will the Telephone
> Company switch rewrite the caller ID ?
> Where is teh caller ID exchanged : q921 or q931 or
> somewhere else ?
>
> Thank you,
>
>
>
>
> =====
> We are NOT Cisco Inc.
>
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