Parameter to knowif it is connected to SIP Server

[Sergio]

Hello!

I would like if there's any standard for this, or what do you use, in 
case you need to know if a VoIP telephone is connected to the SIP server 
via GenieACS.

A parameter which I am seeing is 
/Device.Services.VoiceService.1.VoiceProfile.1.Line.1.SIP.URI/ ... But 
that only tells me the URI of the SIP server, but not if it is connected 
or not. We would like to know if there's a way to perform this.

Thank you!
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