[SIPForum-discussion] Fwd: Phantom Calls on ATA

Sebastian Hauret seba.hauret at gmail.com
Wed Oct 16 12:08:59 UTC 2013

Hi Antoniela,
ATAs need some way to recognise that the caller has cut off. Otherwise, the
call will be ringing at extensions until someone pick up the call.
There are different ways to do that:
--polarity reversal (Depends of the telephony provider)
--CPC (Depends of the telephony provider)
--Call progress tones (


2013/10/15 Antonieta Lobo <antonieta.lobo at gmail.com>

> Hi there,
> We are receiving attacks on our customers ATAs, they receive a direct call
> from unknown source, and the ringing doesnt end until the client pick up.
> Which parameter we can adjust on ATA to solve this problem. The solution
> that i think is that the ATA doesn`t response these invites, but i dont
> know where we can adjust that.
> Thanks!!
> Best Regards
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