[Freeswitch-users] Is it possible add new item in sip message header?

Hi All, We run a mobile app to *register* FreeSWITCH 1.6.20 via sip. This app will check value of server field in message header but the packet sent from FreeSWITCH doesn't have this field. We would like to know is it possible to add filed "Server" to message header by adjusting FreeSWITCH configuration? We tried this by adjusting dialplan ( https://freeswitch.org/confluence/display/FREESWITCH/Sofia+SIP+Stack) <action application="set"><![CDATA[sip_h_Server=xxxxxx]]></action> it works in invite stage, but can not work in register stage. The app checks the filed "Server" in register stage. Thanks in advance. -- Sincerely Albert Hsueh System Engineer Cloudpe Corporation 02-8712 5955 ext. 831 www.cloudpe.com