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Re: App that screens incoming calls

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On 26/09/2018 07.07, nospam wrote:
> In article <14u6auk9cxuoj.dlg@v.nguard.lh>, VanguardLH <V@nguard.LH>
> wrote:
> 
>>>> On the receiving end (your phone), there is no information about the
>>>> caller's number until AFTER the first ring.  Caller ID is sent between
>>>> the 1st and 2nd ring.  There is zero lag when YOU hear the first ring,
>>>> so there is no way for you to pickup the phone until after the first
>>>> ring.  Wait for a second ring, or more, before picking up the phone.
>>>
>>> That's for analog land lines. Not for mobile (which is entirely digital,
>>> both voice and signalling), and AFAIK not for ISDN either.
>>
>> Where do you see a protocol that specifies the CID data is sent before
>> the first ring on the *receiving* end (the user's phone)?
> 
> cellphones and voip send clid during call setup, which is why the
> number shows up *immediately*.

Correct.

> cellphone ringing is generated by the cellphone itself, not the central
> office as with pots, so there is no concept of first or second ring as
> far as the phone network is concerned.

Correct.

>> Whether POTS or digital, CID data is still sent as an analog stream
>> using Bell 202 modulation between the first and second rings from the
>> local switch. If a call is immediately picked up during the 1st ring,
>> the callee may not see the CID data.  This is how it works in the USA.
>> In the UK, line reversal using v.23 or DTMF might be used to announce
>> the CID data without or without issuing a ringing signal. 
> 
> only pots.

Correct.

> there is no 'analog stream' on voip or mobile, which should have been
> the first clue that it does not apply.

Correct.

> 
>> I don't know
>> where Alek is situated.
> 
> it doesn't matter where he is.
> 
>> https://en.wikipedia.org/wiki/Caller_ID#Regional_differences
> 
> it would help if you actually understood what you blindly pull up in a
> search.
> 

Well, the article should be clear that the technology is different for
mobiles.

-- 
Cheers,
       Carlos E.R.

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App that screens incoming calls Alek <alek.trishan@gmail.com> - 2018-09-25 13:19 -0400
  Re: App that screens incoming calls VanguardLH <V@nguard.LH> - 2018-09-25 12:43 -0500
    Re: App that screens incoming calls nospam <nospam@nospam.invalid> - 2018-09-25 13:53 -0400
    Re: App that screens incoming calls Alek <alek.trishan@gmail.com> - 2018-09-25 14:49 -0400
      Re: App that screens incoming calls VanguardLH <V@nguard.LH> - 2018-09-25 16:16 -0500
      Re: App that screens incoming calls M.L. <me@privacy.invalid> - 2018-09-25 17:29 -0500
        Re: App that screens incoming calls VanguardLH <V@nguard.LH> - 2018-09-25 18:05 -0500
          Re: App that screens incoming calls VanguardLH <V@nguard.LH> - 2018-09-25 18:11 -0500
    Re: App that screens incoming calls "Carlos E. R." <robin_listas@es.invalid> - 2018-09-25 21:36 -0400
      Re: App that screens incoming calls Joerg Lorenz <hugybear@gmx.ch> - 2018-09-26 07:36 +0200
      Re: App that screens incoming calls VanguardLH <V@nguard.LH> - 2018-09-26 00:56 -0500
        Re: App that screens incoming calls nospam <nospam@nospam.invalid> - 2018-09-26 07:07 -0400
          Re: App that screens incoming calls "Carlos E. R." <robin_listas@es.invalid> - 2018-09-26 13:20 -0400
  Re: App that screens incoming calls 123456789 <12345@12345.com> - 2018-09-25 15:28 -0700
    Re: App that screens incoming calls Joe Beanfish <joebeanfish@nospam.duh> - 2018-09-26 16:21 +0000
      Re: App that screens incoming calls 123456789 <12345@12345.com> - 2018-09-26 11:18 -0700
  Re: App that screens incoming calls "Carlos E. R." <robin_listas@es.invalid> - 2018-09-25 21:43 -0400

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