The OPX mode allows remote users on FXS ports to appear to a central PBX as a directly connected extension. When the FXO port detects a ring signal from the PBX, the router sends a VoIP call setup to the remote FXS port but it does not take the FXO port off-hook. As a result, the PBX only sees the call answer signal when the RemoteSide router FXS port is picked up.
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Re: FXO-to-FXO disconnection problem. --- Help me please
I'm not sure that this is a supported configuration - essentially you are tying two "central office" ports together back-to-back. It is generaly a bad idea to do this - really you should be using 4-wire E&M to do this, or better still BRI or PRI interfaces.
Nevertheless, you may find that configuring both the router and PBX side to Ground Start signalling may overcome the problem, as the problem you describe is a "fault finding classic". See
A debug vpm all should show you what is happening on the interface. It sounds to me as if you are not getting the tone supervisory signals for some reason - in which case moving to ground start may fix your problem. I would also check with the PBX manufacturer the exact signals that the tone supervision uses, as the Cisco locale settings may not match that implemented by the manufacturer.
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