Nedi,
Here is an example I use as my catchall for people scanning for open PBX's
to make fraudulent calls:
; Don't accept any calls not identified above
exten => _X.,1,Progress()
exten => _X.,n,Gosub(check-cid,s,1)
exten => _X.,n,Set(CDR(userfield)=${EXTEN})
exten => _X.,n,Notify(${CALLERID(num)}|${CALLERID(name)}|${EXTEN}0/
172.20.0.100)
exten => _X.,n,Set(BANIP=${SIPCHANINFO(recvip)})
exten => _X.,n,NoOp(IP is ${BANIP})
exten => _X.,n,System(echo ${BANIP} >> /mnt/kd/banlist)
exten => _X.,n,System(/usr/bin/banadd -s ${BANIP})
exten => _X.,n,Wait(1)
exten => _X.,n,Zapateller()
exten => _X.,n,Playback(the-number-u-dialed)
exten => _X.,n,SayDigits(${EXTEN})
exten => _X.,n,Playback(has-been-disconnected&or&no-longer-in-service)
exten => _X.,n,Playback(check-number-dial-again)
exten => _X.,n,Congestion(5)
exten => _X.,n,Hangup()
Obviously there is some stuff in there that doesn't apply to your needs
(such as banning the initiator's IP and notifying about the scan attempt),
but the rest of it could be utilized. Basically, you do Progress, Wait (I
generally do this for a second), play the error beeps (which helps
eliminator some telemarketing systems), then play a message about the
number being disconnected, fast busy and hang up. Since the call is never
answered, there should be no billing implications. I use a similar dialplan
when getting calls from numbers I blacklist and can confirm that I am not
billed for them. Since it is a legit call rejection message, this should be
in compliance with T&Cs and isn't billing avoidance (like some toll-free
providers do).
David brings up another valid point about payphone surcharges. Not sure if
it applies where you are, but it can get very costly.
--James
On Wed, Jan 20, 2016 at 5:16 PM, David Kerr <da...@kerr.net> wrote:
> For US 800/tollfree there is another issue you have to be alert to and
> that is calls from public pay phones. Albeit they are a dying breed, if
> you do accept a call at your 800 number from a payphone you will likely be
> charged an additional fee that goes to the payphone owner. The supplier of
> my 800 number charges me 55 cents, irrespective of call length. I can
> choose to block calls from a payphone at their portal (I have). All other
> calls bill to me at the same rate -- I think... I admit I don't know about
> calls from Alaska, Hawaii and Canada (areas that might incur a surcharge).
>
> David
>
> On Wed, Jan 20, 2016 at 12:16 PM, James Babiak <ja...@routed.com> wrote:
>
>> I'm not familiar with the phone number syntax of Switzerland, but
>> assuming there is something you can match on reliability in the caller-id,
>> it should be fairly straight forward to create a 'permit' rule to only
>> allow inbound calls from those numbers, and then block everything else.
>> This would most likely being the ideal option, as opposed to trying to
>> manually blacklist everything else.
>>
>> Assuming 0800 means the equivalent of a toll-free (reverse charge) call,
>> you will probably want to make sure you aren't answering the rejected calls
>> in the catch-all section of the dialplan. You can use session progress to
>> play a rejection message and then reject the call so you don't get billed
>> on the blacklisted numbers. Or just reject them flat out, though an 'out of
>> area' type message might help to alleviate confusion.
>>
>> Is this a Swiss number? If so, is it even possible to call it from out of
>> the country if it is toll-free? I know US 8XX numbers can only be reached
>> from the US by default, and have to generally opt-in to get calls from
>> Canada, etc., but can't generally be called directly from Europe, etc. I'm
>> also pretty certain that most US toll-free providers allow you to restrict
>> the calling area down even more (to a specific state or region). If your
>> provider can do this on their side, it might make things even easier for
>> you.
>>
>> --James
>>
>> On Wed, Jan 20, 2016 at 5:28 AM, Michael Keuter <li...@mksolutions.info>
>> wrote:
>>
>>>
>>> Am 19.01.2016 um 23:13 schrieb nedi <n...@gmx.ch>:
>>>
>>> > Hi All,
>>> >
>>> > I have a customer with 0800 Number and I would like to block all
>>> inbound calls to this number. Only Number from switzerland should pass the
>>> filter.
>>> >
>>> > I can make blacklist by provider but i must put every area code
>>> number manual to blacklist
>>> >
>>> > regards
>>> > Nedi
>>>
>>> Hi Nedi,
>>>
>>> I'm not sure if I understood it right, but maybe this is what you need:
>>>
>>> it is called the "ex-girlfriend logic" (no joke): search for it on this
>>> site:
>>>
>>> http://www.voip-info.org/wiki/view/Asterisk+config+extensions.conf
>>>
>>> Basically:
>>>
>>> exten => 1234/_256NXXXXXX,1,Answer()
>>>
>>> Only callers which CallerID starts with "256" can call "1234"
>>>
>>> Michael
>>>
>>> http://www.mksolutions.info
>>>
>>>
>>>
>>>
>>>
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>>
>>
>>
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>
>
>
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