[asterisk-dev] Asterisk UUI

Klaus Darilion klaus.mailinglists at pernau.at
Tue Jun 1 04:56:41 CDT 2010

Hi Davide!

Probably there are several ways to implement that - e.g. (A) really 
terminating the call on one ISDN port and then create a new call on the 
other port (e.g. using Asterisk) or implement (B) a "tap" that just 
forwards everything and sniffs the data.

option (A) should be possible - just configure Asterisk to accept the 
call on port 1 and dial out again via port 2.

The received useruserinfo is put into the channel variable 
"USERUSERINFO". The same variable is used to set on the outgoing channel.

Therefore I guess you need to use something like that in extensions.conf:

; copy user-user info into a global variable so that the
; variable is also available on the outgoing channel
; trunk group 2 is allocated to ISDN port 2
exten => _X.,n,Dial(DAHDI/g2/${EXTEN})


Am 31.05.2010 19:17, schrieb davide picheo:
> Hi All,
> I'm not so skilled in Asterisk/ISDN.
> I need to manage an OpenVoxB400E in a Linux/Asterisk environment in
> order to:
> 1) intercept input traffic from an ISDN phone directly connected to one
> NT cofigured port of B400E
> 2) sniff some infos from D channel: expecially UUI (User to User
> Information)
> 3) forward the call to one output TE configured port of B400E (on demand
> overlapping a tone or silencing B1/B2 channels)
> I need not to introduce echo and keep the D channel unaltered
> (expecially UUI must pass from input to otuput ISDN port without any
> modifications).
> /What kind of customization/patching/recompilation I need to operate?/
> /Thank you in advance!
> /

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