[SR-Users] Sending Notify With Custom Event Header

[strain17]

Hi All,
I'm trying to send a custom NOTIFY message to a list of users that are registered with Kamailio. The procedure would be invoked via HTTP (jsonrpc/xmlrpc over HTTP). 
1. Should I be looking at the t_uac_start/t_uac_dlg MI commands to accomplish this? Is this the best way to do it if the NOTIFY sent to the phones are unsolicited?  2. I tried to use the xhttp_rpc module for testing out tm.t_uac_start but kept running into 400 invalid headers. I'm not sure if there is a syntax issue.

The NOTIFY example is
NOTIFY sip:123 at 192.168.5.5 . . From:333 at 1.1..1\r\nTo:test at 2.2.2.2

    
   - Request URL: http://x.x.x.x/http_rpc/tm/tm.t_uac_start?arg=NOTIFY+sip%3A123%40192.168.5.5+.+.+From%3A333%401.1..1%5Cr%5CnTo%3Atest%402.2.2.2
   - Request Method: GET
   - Status Code: 400 Invalid headers
Thanks for any feedback!
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