MOH when answered by agent inherited from queue

We play MOH for queues with while you are waiting… style messages that use the break out options as well such as press 1 to leave a message.

Unfortunately if an agent answers then puts the caller on hold again they hear original queue MOH which means they will also hear press 1 to leave a message etc… not very appropriate.

Can anyone tell me where about in the dialplan this would be getting set so I can try and override it and use the default musiconhold class instead?