Are you sure that the gateway is properly detecting the tone and hanging up 
when connectivity *is* working? FXO disconnect is terribly hit-and-miss even at 
the best of times. Disconnect supervision on FXO is more of a best-effort 
attempt than an actual thing.

If the disconnect signal is properly interpreted by the gateway then like you I 
would expect the gateway to end that leg of the call regardless of SIP 
reachability. But I consider that a pretty big if!

-mn

From: cisco-voip [mailto:[email protected]] On Behalf Of Ki Wi
Sent: December 13, 2017 12:34 AM
To: [email protected]
Subject: [cisco-voip] FXO hang due to connectivity loss?

Hi Folks,
If the voice gateway is defined with disconnect tone/ cadence,etc. Should a 
loss of connectivity (SIP signaling between VG and CUCM) cause the FXO port not 
to hang up ?

To me , SIP is peer to peer signaling. It should not affect the voice gateway 
decision for going on-hook when a disconnect tone is detected even there is a 
loss of connectivity to CUCM.
--
Regards,
Ki Wi
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