Question: What triggers an MS in MM IDLE state to establish an MM connection locally without dedicated MM signalling?
Option 1: Receipt of a paging message from the network.
Option 2: Completion of a successful voice or video SRVCC handover.
Option 3: Detection of a loss of signal strength below a certain threshold.
Option 4: Expiration of a timer set for periodic location updates.
Explanation: According to the 3GPP specification, an MS in MM IDLE state establishes an MM connection locally when it receives an indication from lower layers that either a voice only SRVCC handover or a voice and video SRVCC handover was completed successfully. This is because the SRVCC handover process involves handing over media streams between the PS domain and CS domain, which requires the MS to establish an MM connection locally without dedicated MM signalling.