asterisk users - May 2011 - SIP Diversion RDNIS - how to get reason parameter?

Hi out there

To play the correct announcement in app_voicemail I whould be able to read the 
SIP Diversion Reason which ist sent by another PBX:

Invite contains:

Diversion: <sip:+41315995003 at 157.161.10.190>;reason=no-
answer;privacy=off;counter=1

Asterisk Logs:

RDNIS for this call is is +41315995003 (reason no-answer;privacy=off;counter=1)

From what I see in the source of chan_sip the variable ${SIPDIVERSIONREASON} 
should be set, but it is empty...
Also ${PRIDIVERSIONREASON} is empty...

I'm using: Asterisk 1.6.2.5-0ubuntu1.3

Any hints?

-Benoit-

2011/5/20 Benoit Panizzon <benoit.panizzon at imp.ch>
> Hi out there
>
> To play the correct announcement in app_voicemail I whould be able to read
> the
> SIP Diversion Reason which ist sent by another PBX:
>
> Are those PBXs directly connected to each other through a SIP trunk ?
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