[Serusers] unsolicited NOTIFY messages from Asterisk

hi, i am getting unsolicited NOTIFY messages from Asterisk after the subscription. Is this type of NOTIFY messages is supported in any of the RFCs..? Because, the SIP stack with 3265 compliance, does not support any such NOTIFY messages and discarding those. I need the justification for this kind of NOTIFY messages sent by Asterisk. I need your valuable inputs... Thanks in Advance, Subashini DISCLAIMER This message and any attachment(s) contained here are information that is confidential, proprietary to HCL Technologies and its customers. Contents may be privileged or otherwise protected by law. The information is solely intended for the individual or the entity it is addressed to. If you are not the intended recipient of this message, you are not authorized to read, forward, print, retain, copy or disseminate this message or any part of it. If you have received this e-mail in error, please notify the sender immediately by return e-mail and delete it from your computer