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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