Puts the existing connected call on-hold.

Puts the existing connected call on-hold and plays an on-hold media.

Puts the existing connected call on-hold and alternates between two media contents for on-hold playback, where the first content is of type LyncPlatformLibraryAudioType and the second content is generated from a client delegate. To be used when needing to speccify content on-hold from more than one source and the second content needs to be dynamically generated, for example: music and current expected waiting time.

Puts the existing connected call on-hold and alternates between two media contents for on-hold playback, specifying the media type as LyncPlatformLibraryAudioType and duration for each content. To be used when needing to specify content on-hold from more than one source, and both content are of type LyncPlatformLibraryAudioType for example: music and a fixed prompt.