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 ().

Regarding the characteristics of single-node networking, which statement is correct () (single choice)

In the converged conference MCU central networking mode, what method does the eSpace PC support to join the conference directly with the chairman authority? () (multiple choice)

The interconnection between two U1900 series unified gateways can only be achieved through SIP trunking. ()

In the U1900+SC solution, if a conference reservation is made through SMC2.0 and a multi-party telephone terminal is called, the following statement is correct () multiple choice