MCU adopts built-in web mode to manage and control, realize the function of () (multiple choice)

A single Media board of VP9660 MCU can support up to () 1080P 30 ports?

In the remote disaster recovery scenario, when the master node (U1981) fails, POTS user A of a branch node (The branch site equipment is U1911). If you make an outgoing call to the local PSTN user B through the branch node, the network element through which the SIP signaling of the call passes is ().

When other conditions are the same, the longer the reverberation time of the room, the clearer the sound heard Clarity. () Right or Wrong

In the SIP session service, which of the following methods is used by the called terminal to realize the interaction of media capabilities? () (single choice)