When an IP Phone user places a PSTN caller on hold, which Music on Hold source will the PSTN caller hear?

A.
User Hold

B.
PSTN Hold

C.
Network Hold

D.
Gateway Hold

Explanation:
User Hold occurs anytime a user puts a call on hold whether the call is from the PSTN or an internal phone. Network Hold is initiated by the Call Manager during Call Transfers, Call Park, Conference Setup, Application Hold (i.e. ICD or AA hole).
(There are two basic types of user hold:
User on hold at an IP phone or other endpoint device User on hold at the PSTN, where MoH is streamed to the gateway Network hold includes the following types:
Call Transfer
Call Park
Conference setup
Application-based hold
Page 5-5,6 , Cisco Music On Hold)