Hi Cesar
 
I guess you could use SUBSCRIBE/NOTIFY for the presence event to get to know the 
off-hook/on-hook state of the presentity [in your case the SIP phone on proxy]..
 
http://www.ietf.org/internet-drafts/draft-ietf-simple-presence-10.txt 
<http://www.ietf.org/internet-drafts/draft-ietf-simple-presence-10.txt>  
would be a good starting point.
 
Thanks!! and have a nice day!!
Jaspreet

        -----Original Message----- 
        From: [EMAIL PROTECTED] on behalf of CÃsar Davi Ãvila do Nascimento 
        Sent: Thu 7/22/2004 2:03 PM 
        To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED] 
        Cc: 
        Subject: [Sip-implementors] SIP Registrar 
        
        

        Hi All,
        
        Is there any SIP Request to a SIP proxy server that would return the state 
(on-hook, off-hook) of the one phone registered in this SIP Proxy? Is it possible to 
know the status of the phones registered to the SIP Proxy servers?
        I Would be glad if someone can help me.
        
        Regards
        
        CÃsar
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