Which statement about G.722.1 codec support on Cisco Unified Communications Manager is true?
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A. B. C. D. E. F.E.
G.722.1 is a low-complexity wideband codec operating at 24 and 32 kb/s.
The audio quality approaches that of G.722 while using at most half the bit rate.
As it is optimized for both speech and music, G.722.1 has slightly lower speech quality than the speech-optimized iSAC codec.
G.722.1 is supported for SIP and H.323 devices.
The correct answer is D. It operates at bit rates of 15.2 and 13.3 kb/s.
Explanation:
G.722.1 is a wideband codec that provides high-quality audio at lower bit rates compared to other wideband codecs. It is also known as Siren 7. G.722.1 codec support on Cisco Unified Communications Manager has the following characteristics:
A. It is not always preferred by Cisco Unified Communications Manager over 711. Both G.722.1 and 711 are supported on Cisco Unified Communications Manager, and the codec used depends on the negotiation between the endpoints.
B. False. This statement is incorrect.
C. G.722.1 is a high-quality wideband codec, but it is not a high-complexity codec. It has low computational complexity and can be used in resource-constrained environments.
D. True. G.722.1 operates at bit rates of 15.2 and 13.3 kb/s. This is lower than the bit rate of other wideband codecs such as G.722 and G.729. G.722.1 can be used in environments where bandwidth is limited.
E. G.722.1 is supported for SIP and SCCP devices. SCCP is a Cisco proprietary protocol, and it is used in Cisco IP Phones.
F. G.722.1 is not supported for H.323 devices. H.323 is an ITU-T protocol for multimedia communication over IP networks.
In summary, G.722.1 is a wideband codec that is supported on Cisco Unified Communications Manager. It operates at lower bit rates than other wideband codecs and is suitable for resource-constrained environments. It is supported on SIP and SCCP devices but not on H.323 devices.