In a DirectPlay voice session, a similar process of host migration occurs in peer-to-peer voice sessions, except that the voice host migrates independently of the DirectPlay network session. The voice host migrates when the server calls IDirectPlayVoiceServer::StopSession or if the voice host stops responding.

When the voice host migrates, the new host's voice client message handler receives a DVMSGID_LOCALHOSTSETUP message. The primary purpose of this message is to allow the new host to provide DirectPlay with a pointer to the callback message handler that will receive voice server messages. To specify your callback message handler, set the value of the pMessageHandler member of the DVMSG_LOCALHOSTSETUP structure to point to your voice server message handler before you return from the client message handler. The new host can also specify a voice server context value by setting the value of the pvContext member of the structure.

Each client in the voice session receives a DVMSGID_HOSTMIGRATED message with the DVID of the new host. The client that is chosen as the new host also receives a valid IDirectPlayVoiceServer pointer, which the client can use to call the voice server methods. The new host does not receive DVMSGID_HOSTMIGRATED until after it has processed DVMSGID_LOCALHOSTSETUP.