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This protocol differs from [RFC3551], as it supports both the mono (1 channel) and stereo (2 channels) G722 encoding. G722 mono encoding is specified in [RFC3551] section 4.5.2.
G722 stereo encoding concatenates two G722 mono encodings, with the left channel’s encoding at the beginning, followed by the right channel’s encoding. It is a simple concatenation of two mono G722 frames with the following format:
Left channel’s G722 encoding || Right channel’s G722 encoding
G722 stereo encoding uses payload type 117. G722 mono encoding uses payload type 9 or 117.