In an enterprise's VoIP network, only one U1981 is deployed. One day, the U1981 fails and as a result, all phones at the enterprise's headquarters and branches fail to work. To prevent this situation from happening again, which of the following approaches can be taken? (Multiple Choice)
Which of the following statements is CORRECT about networking schemes in which AR voice routers function as local gateways?
The administrator can set different user levels for accessing the corporate directory. Lower-level users cannot query information about higher-level users in the corporate directory.
During automatic switchboard configuration on a U1900 series unified gateway, the outgoing call permission of the VU must be set to () to implement the following requirement: When users dial the automatic switchboard number, the calls are forwarded only to intra-office numbers.
In a multi-node centralized network, there is a central node with a U1981 deployed and a branch node with a U1911 deployed. SIP user A under U1911 calls an external PSTN user through the branch node's El trunk. After the call is connected, the path along which the RTP streams are transmitted is ().
During software installation, you can first install the eServer and then the BMU and database.