Hello, I am working on a PJSUA2 porject with Java language. We would like to send a NOTIFY to for security control. So far we don't find any way to send such NOTIFY via PJSUA2 and Java as below: ==================================================== 14:03:51.645 pjsua_core.c .TX 402 bytes Request msg NOTIFY/cseq=65015 (tdta0x10782b0a8) to UDP XXX.XXX.XXX.XXX:5060: NOTIFY sip:11@saht.xxx.com SIP/2.0 Via: SIP/2.0/UDP XXX.XXX.XXX.XXX:5060;rport;branch=z9hG4bKPjoAy8M3oN3FmjHY5Kiwp-BXh.xxOqI40. Max-Forwards: 70 From: <sip:11@saht.xxx.com>;tag=Es3krT3DmPDeEqJkX-Hqz4VjTszdRStZ To: <sip:11@saht.xxx.com> Call-ID: ZeoG.MQxkYf65eK-KM9qjpIcLWw2Q21P CSeq: 65015 NOTIFY Content-Type: application/simple-presence Content-Length: 19 security=command1 ==================================================== Any suggestion would be appreciated. Thanks.