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Question ID 12907	Which two data frame lengths are supported by iLBC? (Choose two.)
Option A	10 milliseconds
Option B	20 milliseconds
Option C	30 milliseconds
Option D	40 milliseconds
Option E	50 milliseconds
Option F	60 milliseconds
Correct Answer	B,C

Explanation Explanation: iLBC-Internet Low Bit Rate Codec (iLBC) provides audio quality between that of G.711 and G.729 at bit rates of 15.2 and 13.3 kb/s, while allowing for graceful speech quality degradation in a lossy network due to the speech frames being encoded independently. By comparison, G.729 does not handle packet loss, delay, and jitter well, due to the dependence between speech frames. iLBC is supported for SIP, SCCP, H323, and MGCP devices.

Question ID 12908	What is the minimum number of H.225 messages required to establish an H.323 call with bidirectional media?
Option A	1
Option B	2
Option C	3
Option D	4
Option E	5
Option F	Correct Answer*:   B. Explanation: A typical H.245 exchange looks similar to below figure After this exchange of messages, the two endpoints (EP) in this figure would be transmitting audio in each direction. The number of message exchanges is numerous, each has an important purpose, but nonetheless takes time. For this reason, H.323 version 2 (published in 1998) introduced a concept called Fast Connect, which enables a device to establish bi-directional media flows as part of the H.225.0 call establishment procedures. With Fast Connect, it is possible to establish a call with bi-directional media flowing with no more than two messages, like in figure 3. Fast Connect is widely supported in the industry. Even so, most devices still implement the complete H.245 exchange as shown above and perform that message exchange in parallel to other activities, so there is no noticeable delay to the calling or called party.
Correct Answer	B

Explanation

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