[Asterisk-Dev] Does anyone have docs on the Q.931 "high layer compatibility" IE?

[Steve Underwood]

Hi Steve,

Number presentation issues are usually related to the NPI and TON 
fields. Not to the use of additional IEs.

Steve


steve at daviesfam.org wrote:

>Hi,
>
>We're interworking from Asterisk to a local, popular, PBX.
>
>I've got a little patch or two for issues we had - which I'll put on bugs 
>shortly.
>
>We've just got a very subtle issue left - digital phones on the PBX 
>display callerid "differently" when the calls come from Asterisk as to 
>when coming from the telco.
>
>The PBX still gets the callerid and dnid fine, and presents them fine to 
>other ISDN interfaces - its just about the display on their proprietary 
>digital phones.
>
>I think it has to do with Asterisk not including a "high layer 
>compatibility" IE in its call setup.  I see these coming from the telco, 
>but not generated by Asterisk.
>
>Does anyone have docs on how this IE is structured and what it means (my 
>ISDN/SS7 book is not specific enough).
>
>I did find a decoder in the ethereal source but somehow it doesn't seem to 
>quite match up to what I'm seeing come from our telco.
>
>Thanks for advice, docs, or pointers...
>
>Regards,
>Steve
>  
>