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<p>Scott,</p>
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<p>You are correct, it is the default. Oddly, what I meant to suggest is that you try disabling (<i>no battery-reversal</i>) but it seems that I suggested you to enable it (in which it has always been enabled). Try disabling the support and see what happens.</p>
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<p>Apologies!</p>
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<p>Thanks,</p>
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<p>Ryan<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" color="#000000" face="Calibri, sans-serif"><b>From:</b> Hughes, Scott GRE-MG <SHughes@GREnergy.com><br>
<b>Sent:</b> Sunday, September 11, 2016 7:13 PM<br>
<b>To:</b> Ryan Huff<br>
<b>Cc:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> Re: [cisco-voip] FXO Disconnect Detection</font>
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:-/ unfortunately, that command must already be a default is IOS 15.5M because it doesn't show up in the running config after I put it in.<br>
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Thanks for the suggestion though!<br>
<br>
<br>
On Sep 9, 2016, at 6:21 PM, Ryan Huff <ryanhuff@outlook.com<mailto:ryanhuff@outlook.com>> wrote:<br>
<br>
EXTERNAL<br>
<br>
You may try enabling support for battery reversal detection on the voice port;<br>
<br>
voice-port x/x/x<br>
battery-reversal<br>
!<br>
<br>
-Ryan<br>
<br>
On Sep 9, 2016, at 6:57 PM, Hughes, Scott GRE-MG <SHughes@GREnergy.com<mailto:SHughes@GREnergy.com>> wrote:<br>
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Hi,<br>
<br>
I have a Cisco 2921 H.323 gateway tied to CUCM 11 with 4 FXO (loop start) ports in a trunk group. Unanswered calls get forwarded to an offsite answering service (hairpinning out of the same set of FXO ports). Ports are setup with "connection plar opx 1000"<br>
<br>
My issue is that ports don't detect when the other end hangs up. When a remote party hangs up, the VoIP phone stays off hook and eventually plays a dial tone, followed by an operator message.<br>
<br>
I suspect that the forwarded calls terminate but both FXO ports in the hairpin stay off hook indefinitely.<br>
<br>
How can I combat this problem? I can reach out to the telco but need to know what to ask for.<br>
<br>
I am located in the US, if that makes a difference. I've read many articles about supervisory disconnection but none really help with troubleshooting steps or timers to tweak.<br>
<br>
-Scott<br>
<br>
<br>
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NOTICE TO RECIPIENT: The information contained in this message from<br>
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