Tài liệu Cisco Design Essentials: Cisco IP Telephony- Enterprise Voice Over Data Design Test pdf

Cisco Design Essentials: Cisco IP Telephony￾Enterprise Voice Over Data Design Test

1) Cisco supports and is certified with the Lucent Octel 250 and 350 for CallManager 2.x.

a. True

b. False

2) How many bytes of padding would be in the payload of an ATM AAL5 cell containing 20 ms of G.729

voice?

a. 20

b. 28

c. 44

d. 48

3) Consider this scenario. You have two branch offices using IP telephony with CallManager 2.4. To handle

admissions control between the two offices over a WAN, which of the following solutions will work?

· Solution A: Use a central CallManager (perhaps redundant CallManagers) with each office being a

separate region. Intra-region calls can be G.711, but inter-region calls can be G.729 (unless to voice mail).

Limit WAN bandwidth at each egress point and block calls that will exceed that level.

· Solution B: Put a CallManager in each location and network them together using H.323 (running on a

Cisco IOS gatekeeper). You can then use the zone bandwidth feature to limit the number of calls and force

overflow to the Public Switched Telephone Network (PSTN).

a. Solution A

b. Solution B

c. Either A or B