Comfort noise is artificial noise played by an audio device in a call. It fills in the gaps when the other party in the call is not sending packets due to silence suppression. To enhance the comfort noise generation in Office Communications Server 2007 R2, endpoints support sending a comfort noise packet at the end of a talk spurt. The packet marks the start of silence suppression, and it provides information about the type of comfort noise to be generated. This enhancement helps ensure that comfort noise is generated at the appropriate volume level, and it removes distortions caused by transitions between speech and comfort noise. The comfort noise packet is described in detail in IETF RFC 3389.