asterisk users - Jul 2004 - SIP Hard Disconnect Detection

Hello. I have a question regarding Asterisk internal API.
I am developing a new asterisk module application using asterisk internal c
API. I am having problem detecting hard hangups when the SIP clients
disconnect (suppose power goes off in the phones). I am not receiving any
disconnect control frames and don't know how to check if the clients are
really connected. Can anyone help?

Thank you,
Pedro Goncalves

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