[asterisk-dev] Set and get Information Elements (IE)

[Richard Mudgett]

> I have two asterisks connected via PRI. (Current Version is 1.8 and
> the
> card is a Digium TE410 using DAHDI)
> The objective is to pass Meta-information with the call. When I take
> a
> look at Q.SIG, EUROISDN / DSS1 and so on
> there is the possibility for using "userfields" e.g. UUS1. All these
> information are protocolled as Information Elements.
> When I trace the ISDN Communication (pri intense debug...) I can see
> und
> understand some "standard" IEs.
> Is it possible (and if, how) to set and get the standard / my own IEs
> for transferring (very little / some bytes) of
> binary extra information during the dial / call-setup? I cannot use
> the
> callerid to transmit this information..

You cannot get/set arbitrary IEs with Asterisk/libpri.  The closest you
can get with the current architecture is the user-user IE.  Support for
it is normally conditionaled out and it is setup for null terminated strings
instead of arbitrary binary data.  You might also consider passing this
information as a subaddress if you control both sides.

Richard