[OpenSIPS-Users] how let the different modules communicate with others

[jiangzaiweig]

hello , i am jzw.
 Recently i study the opensips, and i want to modify the opensips to fit my
project, but i met a problem that i can't let the different modules
comminicate with each others, is the "struct sip_msg" a global variable?
How can i add some variables which will be the session character?
Can you help me ?
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