Survivable Remote Site Telephony

Review Questions

You can find the solutions to these questions in Appendix A, "Answers to Review Questions."

1.	Which is a benefit associated with gatekeeper call admission control? no requirement to configure Cisco IOS commands on the gatekeeper no requirement to configure an Intercluster Trunk between clusters provides emergency call-handling capability if the WAN link fails provides call admission control over the intranet in addition to the WAN
2.	Without call admission control, what happens to existing calls when the next call oversubscribes the WAN? All calls are dropped. Voice quality on all calls degrades. Voice quality on the last call degrades. Nothing happens if the router is configured for QoS.
3.	Which two characteristics are associated with the distributed call-control environment? (Choose two.) Intercluster Trunk to each Cisco CallManager cluster gatekeeper-controlled trunks maximum bandwidth determined on the Cisco CallManager zones and bandwidth allocation configured on the gatekeeper
4.	How do the Cisco IP Phones in a branch site know how to register to a gateway running SRST? The IP Phones stop receiving keepalive packets from the SRST gateway. The IP address is configured on the gateway and passed to the IP Phone. The gateway IP address is specified in the SRST Reference Configuration window and assigned to a device pool. The device pool contains the IP address reference to the SRST gateway.
5.	Using the Cisco CallManager locations feature, how many simultaneous audio calls can be placed over a given WAN link with 128 kbps of available bandwidth using a G.729 codec? two three four five
6.	AAR derives the alternate dial string used to route the call over the PSTN from which three of the following? (Choose three.) DN external phone number mask AAR calling search space MAC address PSTN prefix AAR group
7.	Which command is used to initiate SRST capabilities on an IOS-based router? telephony-service call-fallback call-manager-fallback ccm-communication
8.	You are working in a location-based CallManager deployment. Phone A (DN=3423) dials onnet to Phone B (DN=3420). The location-based CAC denies the call and AAR initiates. Which external phone number mask will be used by AAR to complete the call? Phone A Phone B the gateway at the calling site the gateway at the called site
9.	What is the default state of AAR in a CallManager cluster? AAR is enabled, but must be configured by an administrator. AAR is enabled and preconfigured, provided the administrator has entered the correct external phone number masks under the applicable DNs. AAR is disabled until a feature license is applied. AAR is disabled.
10.	You have AAR configured in a cluster to divert calls to the PSTN should the IP WAN become unusable. To test the configuration, you disconnect the WAN and place a call to an alternate site. The CallManager returns a reorder tone. You are sure the digit transformation settings are configured correctly; what is the most likely cause of this problem? AAR does not function in a distributed call-control environment. The AAR calling search space does not provide the necessary privileges to complete the call. The standard calling search space does not provide the necessary privileges to complete the call. AAR does not function during a WAN failure.