Settings for MOH codecs are located under Service --> Service Parameters --> Cisco IP Voice Media Streaming App service. Under the "Service Wide Parameters" section, select the desired codec(s) in the "Supported MOH Codecs" field. (Hold down the Ctrl key to select more than one codec).
Short of sniffing the wire for the MOH stream there isn't really a way to verify which codec is being used. However, the MOH codec in use (if more than one is enabled) will be determined by the settings configured in CallManager under "Region" configuration. If all devices are in a single Region, then the codec you select for that Region should determine the type of MOH codec to be used. If multiple Regions are configured, then MOH codec is determined by the Region codec configuration that the receiving device resides in.
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