Re: failed-Incoming-Outgoing call collision in MGCP gateway
If you are sure that your DSPs have been provisioned appropriately (i.e. you have sufficient for the number of channels you are running) and that the PBX end of the connection isn't rejecting the call... you may be hitting a bug with the DSPs - I've seen it before where a single channel will lock up and log this collision error when CallManager tried to use it.
If this happens to be the first or last channel it can block all calls as CM will repeatedly try the same channel.
You could try busying it out using the MGCP service parameters, or just rebooting the gateway to see if it resolves it temporarily.
If it doesn't then a config/DSP resource issue is more likely..
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