Which statement is true about the Cisco Unified CM music on hold feature, during supervised transfers, for the Cisco Unity Connection SIP trunk integration?

Invoking an MTP resource on the SIP trunk does not resolve the MOH limitation, as the restriction is architectural to the SIP trunk integration's transfer handling, not a media termination capability gap.

The limitation is not a restriction on which MOH source can be used - MOH is entirely unavailable in this integration scenario, not merely limited to the default source.

The SIP trunk integration between Cisco Unified CM and Cisco Unity Connection does not support music on hold during supervised transfers. This is a documented limitation inherent to how the SIP trunk integration model handles transfer signaling, meaning no MOH audio source - whether default, custom, or multicast - can be delivered to the held party during this call flow.

Multicast MOH is not an available workaround; the feature is unsupported in this integration regardless of the MOH delivery method configured.