[asterisk-users] BT line: unavailable vs withheld numbers?

[Vladimir Mikhelson]

AJ,

Banging my head other a similar problem here in US.

What I know so far the callerid function produces the following bitmap flag:

 1. CID Private Name
 2. CID Private Number
 3. CID Unknown Name
 4. CID Unknown Number
 5. CID Message Waiting
 6. CID No Message Waiting

For example, Flag=3 means Private Name and Number.

If a Number and / or a Name are blocked for whatever reason a Null value
is written to the respective returned parameter.

What I do not know is how to analyze the flag in a dialplan.

The problem with analyzing a Null value as you mentioned in your message
is with multiple source causes:

  * CID recognition failure
  * CID unknown
  * CID blocked

-Vladimir



On 10/11/2011 6:16 AM, A J Stiles wrote:
> On a BT line, how do I determine whether the number on an incoming call has 
> been deliberately withheld  (by dialling 141)  or is merely unavailable  (e.g. 
> because it originated from overseas or passed through some ancient switching 
> equipment)  ?
>
> In the first case, I want the caller to be played a message to the effect that 
> we are not at home to anonymous cowards but if their business is important, 
> they may redial without withholding their number.  In the second case, the 
> call needs to be treated as legitimate since it is not really the caller's 
> fault that their number is not available.
>
> Software is Asterisk 1.8.5.0 with DAHDI 2.4.1.2.  Hardware is TDM410P with two 
> each FXO and FXS modules.
>
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