[Freeswitch-users] Adding headers to INFO messages for Advice of Charge on SNOM

[Keith Laaks]

Hi,

I have tried maintaining charging information on a SNOM 300's display
using 'display' - but found that the phone has some timer, whereby every
60 seconds it wipes out whatever happens to be on the display at that
time and replaces is with the dialled number. So not a viable option as
it impacts usability. Really annoying when the display was just updated 
with valuable information for the user and a split second later it gets
replaced. 
[If somebody knows how to disable this behaviour - please do tell...] 

I see that SNOM supports a number of features for Advice of Charge.

>From their Wiki: 

http://wiki.snom.com/Advice_of_charge_%28AOC%29_in_SIP
Example of an SIP-Info Message:

-----------------------------------------------------
INFO sip:bla at snom.com SIP/2.0
From: <biller at snom.com>;tag=5354n3
To: <ua at snom.com>;tag=33rfh3
CSeq: 23423 INFO
Call-ID: 3452tw43dt354dm03
AOC: charging;state=active;
 charging-info=currency;
 currency=EUR;
 amount=2000;
 multiplier=0.001
Content-Length: 0
----------------------------------------------------- 

So the question - Is there some method available today to add these additional
 'new' headers to an INFO message I can send out to these phones?

If not, I guess it's a matter of looking at enhancing the "case SWITCH_MESSAGE_INDICATE_DISPLAY" section in mod_sofia.c ?


Best Regards

Keith