[asterisk-users] CallerID inconsistently presented through ISDN/cellular networks

[Olivier]

2011/10/11 A J Stiles <asterisk_list at earthshod.co.uk>

> On Tuesday 11 October 2011, Olivier wrote:
> > Hi,
> >
> > I'm facing a strange problem.
> >
> > My setup is:
> > Alice cellphone <--GSM--><--ISDN--> Asterisk <-- ISDN --><--GSM--> Bob
> > cellphone
> >
> > When Alice calls Asterisk which forwards the incoming call to Bob,
> > sometimes Bob sees Alice's number, sometimes he sees a default CallerID
> > (which happens to match the dialed number and the ANI).
> > For various reasons, Bob really needs to see Alice's number when Alice is
> > calling.
> >
> > When I compare one "successful" (ie presented with Alice ID) calls with
> one
> > "unsuccessful" (with debug and verbose levels respectively set to 0 and
> 3),
> > I can't see any difference between both calls within Asterisk logs :
> > every time Asterisk, receives Alice CallerID and set outgoing channel
> > CallerID with the same value.
> > (The only I could find, at the moment, to distinguish a successful call
> is
> > to call Bob and ask him to tell what happened).
> >
> > If that matters, let me add this:
> > - each incoming call is forwarded with a simple Answer(), Dial()
> sequence,
> > - when I'm presenting an outgoing with too many digits, the call is
> > presented with a default CallerID.
> >
> > My understanding is "as each network used is purely digital, you can't
> > loose CallerID".
> > Is this roughly correct ?
> > In which direction, shall I dig ?
>
> Most telcos won't let you present a caller ID number that doesn't belong to
> you; so it's possible that the number you are presenting to Bob is being
> munged on the way to his mobile.  Otherwise, anybody with the right
> equipment
> would be able to pretend to be anybody else, and caller ID would be all but
> useless.
>
> Anyway, what you really need to do is separate the two legs of the call, to
> see whether the number is changing between Alice and your Asterisk or
> between
> your Asterisk and Bob.  So put a Verbose() or NoOp() in your dialplan to
> see
> what caller ID Alice is sending, and get her to call you several times.
>  Then
> create a context to call Bob  (presenting Alice's number)  from a SIP
> phone,
> and call him several times.
>

It's on my ToDo list.
I'll report here.

>
>
>
> --
> AJS
>
> Answers come *after* questions.
>
> --
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