This is an informational message sent when a call is disconnected. This message displays the remote name and number, which it receives from the PPP authentication or from the location at which the dialer placed the call. This message also reports the duration of the call.
The reason you probably have these call disconnected is during PPP negotiation so you can monitor this by enabling the following debugs
debug ppp authentication
debug ppp negotiation
debug isdn q931
Above commands show the reason for the unknown numbers
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