TELECOM Digest OnLine - Sorted: Re: Caution: Unidentified Callers - VoIP

Re: Caution: Unidentified Callers - VoIP

Rick Merrill (
Sun, 16 Jul 2006 20:47:37 -0400

Thor Lancelot Simon wrote:

> In article <>, Rick Merrill
> <> wrote:

>> Thor Lancelot Simon wrote:

>>> In article <>,
>>> Rick Merrill <> wrote:

>>>> I suspect from the way current VoIP calls are structured that it would be
>>>> (a) very easy to spoof the number,
>>>> (b) impossible to enforce upon overseas numbers and
>>>> (c) too easy to make the number unavailable in the first place. Heck,
>>>> even the doctor's office number is "unavailble".

>>> This is all false. Why do we have this same discussion over and over
>>> again every few months?

>> Well, you don't say where you think you got your information.

> I got it from 10 years of design and analysis experience with the
> underlying protocols; that it is impossible to "spoof" calling party
> ID in properly configured SS7 networks whose operators do not configure
> trunks to _customers_ as if they were trunks to _network equipment_ is
> simply a matter of fact.

> As all the interworking standards make clear, any interworking to a
> protocol which does not differentiate between customer-provided and
> network-provided calling party identification must either use the
> supplied number as a customer provided number only, or replace it with
> the BTN for the trunk.

> Thor Lancelot Simon

> "We cannot usually in social life pursue a single value or a single moral
> aim, untroubled by the need to compromise with others." - H.L.A. Hart

How may SS7 are in use with a VoIP call? As few as zero for PC 2 PC.

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