Our client is using Cisco 1760 8-port FXO running IOS image 12.3 6(f) .After the calls made from this FXO are disconnected,the corresponding voice ports dont get released and remain in the state 'S_CONNECT'.For enabling proper operation,we have to manually reset the ports.Also this problem occurs intermittently and not on regular basis.
Some lines can be stubborn with disconnecting properly even with supervisory-disconnect , so you may end up having to look at changing lines to groundstart.
I have seen this once or twice on older IOS versions due to software issues. On the 1760, I would highly recommend you try to get on a newer 12.3T code if possible like 12.3(11)T10 or maybe 12.3(14)T7 or whatever latest is. Not saying it will fix your issues, but I've personally ran into a lot of FXO/voice/dsp problems on 1760 series that are fixed after 12.3(4)T for most part. Just my 2 cents.
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