how to add event Call-Info in SIP INVITE Header.

[mic.max]

Is possible to modify SIP INVITE Header, to add the event call-info?

I need to add Call-Info event in SIP Header for my snom phones to take the picture of the contacts from the server, the header should enter a instruction like this:

Call-Info: <http://192.168.1.80/images/PBEntry1.jpg>; purpose = icon

Thanks