[Freeswitch-users] Caller Authentication

David Knell dave at 3c.co.uk
Sun Aug 30 09:25:17 PDT 2009

Hi Max,

I think that the answer is generally no - for example, I'm trivially
easily able to place a call to my GSM phone with any CLI that I choose.
If you can work around that, then consider the case where I divert my
GSM phone to you - the call to you will come from the GSM network, but I
can still set an arbitrary CLI.

Cheers --


> Guys,
> This question might be a bit off-topic, so please bear with me as i
> could hardly find a better place to solicit some help.
> I suspect caller authentication can be challenging in the broader
> context of VoIP/SIP. Now, if we restrict the set of calls to those
> coming from the GSM network, is there a way to tell if the Caller Id
> is coming from the right source?  It doesn't need to be a
> bulletproofed solution. For instance, if i can already say that a
> given call is certainly coming from a GSM network (and that the call
> metadata weren't tampered with), i could maybe rely on the GSM
> authentication mechanism. 
> Any idea?
> Max.
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David Knell, Director, 3C Limited
T: +44 20 3298 2000
E: dave at 3c.co.uk
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