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

[steve at daviesfam.org]

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