Hello<br>You must record the sound of busy or congestion tone and define the frequency in <br>router<br><br><div class="gmail_quote"><div dir="ltr">On Mon, Sep 12, 2016 at 5:21 AM Sreekanth <<a href="mailto:sknth.n@gmail.com">sknth.n@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div><div><div><div><div><div><div><div>Hi Scott,<br><br></div>When reaching out to the telco, ask them what kind of disconnect they're doing. Is it:<br></div>1. Battery reversal<br></div>2. Power denial<br></div>3. Supervisory disconnect - tone played by the telco to indicate a disconnect<br><br></div>You've mentioned that when the remote party disconnects, the VoIP phone stays off hook. Do you hear a disconnect tone during this period? If so, the telco is using supervisory disconnect.<br></div>In that case, your DSPs on the router may need a tweak. You can do 2 things:<br></div><br>1. Take pcm captures on the router to capture the disconnect tone. Then open a case with TAC who can decode this and give you the settings for the supervisory disconnect.<br></div>2. Do the ds0-dump on the router and capture the tones, decode them yourself using Audacity and put in the settings.<br><br></div>DS0-dump: <a href="http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-system/115749-analyze-pcm-data.html" target="_blank">http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-system/115749-analyze-pcm-data.html</a><br><br></div>Video for setting up pcm captures and Ds0-dump.<br><a href="https://www.youtube.com/watch?v=HkPjTBvx_YA" target="_blank">https://www.youtube.com/watch?v=HkPjTBvx_YA</a><br><br></div>Cheers!<br></div><div class="gmail_extra"><br><div class="gmail_quote">On 12 September 2016 at 05:30, Ryan Huff <span dir="ltr"><<a href="mailto:ryanhuff@outlook.com" target="_blank">ryanhuff@outlook.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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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 dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><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> <a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><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>
<br>
Thanks for the suggestion though!<br>
<br>
<br>
On Sep 9, 2016, at 6:21 PM, Ryan Huff <<a href="mailto:ryanhuff@outlook.com" target="_blank">ryanhuff@outlook.com</a><mailto:<a href="mailto:ryanhuff@outlook.com" target="_blank">ryanhuff@outlook.com</a>>> wrote:<br>
<br>
EXTERNAL<br>
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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>
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On Sep 9, 2016, at 6:57 PM, Hughes, Scott GRE-MG <SHughes@GREnergy.com<mailto:<a href="mailto:SHughes@GREnergy.com" target="_blank">SHughes@GREnergy.com</a>>> wrote:<br>
<br>
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>
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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>
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I suspect that the forwarded calls terminate but both FXO ports in the hairpin stay off hook indefinitely.<br>
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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>
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<br>
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