[Asterisk-Users] Q: How to get the preset callerid from a CLID-no-screen E1-PRI

[Peter Svensson]

On Sat, 5 Feb 2005, Peter Svensson wrote:

> The behaviour you are seeing is described by ETSI ETS 300 092-1 Annex B. 
> According to 1TR67 this option *is* in use in Germany. 
> 
> ETS 300 092-1 by default requires a strict checking of the calling number 
> (paragraph 9.3). An alternate method available by special ararngement 
> (paragraph 9.4) allows the sending of unscreened calling numbers. In this 
> later case Annex B allows the network to add the network provided calling 
> party number after the unscreen part. 

The Annex B option seems to be common in Europe. The Swedish incumbent, 
Telia, also uses that option. Actually, their implementation document is a 
lot easier to read than Deutsche Telekom.
   http://www.telia.se/upload/upload_doc/ch5revf.doc
Clause 5.2.20 describes CLIP handling, including the behaviour you 
observed. The receiving subscriber has the option to only received the 
unscreened number or to receive both the screened and unscreened numbers.

It seems resonable that Asterisk should be extended to handle the case 
where both occur and pass both to the dialplan.

Peter