Bruce,
If you have your own PRI-T1, you can do this when someone dials the *67.
You still get the callerid number, but the CallerID Presentation Byte is
normally set to restricted or unavailable. I think there's a rule
somewhere that forces you to respect the callerid Block and to not
display the callerid to the end caller.
Not sure if Asterisk gives you access to the call IEs. but here's the
format for this IE:
Calling Party Number IE
1 03h CALLING_PARTY_NUM_IE
********************************
2 xxh IE count
3 xxh Type Of number
00h : Unknown (default)
01h : international number
02h : national number
03h : network specific number
04h : subscriber number
06h : abbreviated number
07h : reserved extension
4 xxh Numbering Plan
00h : unknown (default)
01h : ISDN/telephony numbering plan
03h : data numbering plan
04h : telex numbering plan
80h : national standard numbering plan
09h : private numbering plan
0Fh : reserved for extension
5 xxh Presentation indicator
00h : Presentation allowed (default)
01h : Presentation Restricted
02h : Number not available due to interworking
6 xxh screening indicator
00h : user-provided not screened
01h : user-provided, verified and passed
02h : user-provided, verified and failed
03h: network provided
7 xxh Number digit
ASCII Digit
8 xxh Number Digit
ASCII Digit
… … …
31 xxh Number Digit
ASCII Digit
You could probably modify the source code to access this IE information
or make Asterisk to believe the callerid is not restricted. You would
need to modify the file q931.c from the libpri library to change how
Asterisk handles restricted callerid data.
It could be illegal to change the callerid presentation information in
Canada. I'm not sure what are the laws around this stuff, but the
information in this email is just to explain you how the callerid is
delivered on PRI-T1 signaling. I wouldn't change it in a production
environment.
I had to deal with this IE information lately to fix a callerid issue
from one of the Mobile phone company. They were using a different
presentation byte and we needed to change the callerid presentation
function to be able to receive/present the callerid numbers from one of
the Mobile phone company.
Cheers.
Stephan Monette
Unlimitel Inc.
Tel.: 613-688-6212. x221
TF : 1-877-464-6638, x221
FAX : 613-482-1077
Bruce Nik wrote:
Hello everyone,
Just had a chance to look at something that was posted on voipinfo.org today:
http://www.engadget.com/2008/07/21/how-to-reveal-blocked-caller-id-info-a-video-guide-to-risky-beh/
The publisher claims to unblock the *67 calls that are received to his Asterisk server by manipulating the P identity.
How true is this?
Does it work with certain providers?
I thought the caller ID block happens and CO and never gets passed to the phone set.
Bruce
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