Calls mute when recieve second call

I am failing to receive simultaneous calls, every time a second call enters into the DID configured on my system the current connection is muted and disconnected from the CLI.

can anybody help me?

thanks

What type of phones?
Is CW enables?
Please post logs of a failed call.
https://wiki.freepbx.org/display/SUP/Providing+Great+Debug#ProvidingGreatDebug-AsteriskLogs

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