Hello Everyone,
I asking question/request to add improvement for msilo module where will have ability set $avp(i:body) in mod params.  That will allow use it in m_store() by specifying  body message $avp.  In my case registration is on B2BUA so kamailio pass through/proxy  to destination. In order to check user status online/offline kamailio wait for reply from B2BUA on MESSAGE status if it return error 503 that mean user offline and m_store(0 should store message in db, but the issue that error 503 is in final stage and MESSAGE body is not available any more.  The improvement  will allow specify  body $var in m_store() so new way will be m_store($tu, $avp(body)). 

Any help thank you.

Slava.