Thanks for writing me for the question. Yes in the VoIP solution, the traffic that doesn't fall into one of the class-map that you have configured, will fall into the class-default. I can point to a document that tells about it.
The default class has these characteristics: 16 dynamic queues are reserved for traffic that does not meet the match criteria of other classes whose policy is defined by the policy map called policy1, and a maximum of 20 packets per queue are enqueued before tail drop is enacted to handle additional packets.
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
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