which of the following codecs should be displayed in th…

You issue the show running-config command on a CME router and receive the following partial output:

Examine the output, and use the information you gather to answer the question.
Based on the configuration, which of the following codecs should be displayed in the call statistics when a user
presses the ? key twice on an IP phone? (Select the best answer.)

A.
G.711 alaw
two seconds

B.
G.711 µlaw
four seconds

C.
G.726
six seconds

D.
G.729
eight seconds

E.
iLBC
10 seconds

G.
711 encoding exist: µlaw and a-law. Only the United States, Canada, and Japan use the G.711 µlaw codec to
encode audio data; the rest of the world uses G.711 a-law. To configure a dial peer to use the G.711 a-law
codec, you should issue the codec g711alaw command in dial peer configuration mode. To configure a dial
peer to use the G.711 µlaw codec, you should issue the codec g711ulaw command in dial peer configuration
mode.
The G.726 codec will not be used by the dial peer. The G.726 codec is a medium complexity compression
codec. To configure a dial peer to use the G.726 codec at a bit rate of 32 Kbps, you should issue the codec
g726r32 command in dial peer configuration mode.
The Internet Low Bitrate Codec (iLBC) will not be used by the dial peer. The iLBC codec is a nonproprietary,
high- complexity compression codec that consumes bandwidth at a rate of up to 15.2 Kbps. To configure a dial
peer to use the iLBC codec, you should issue the codec ilbc command in dial peer configuration mode.
https://www.cisco.com/en/US/docs/ios/12_3/vvf_r/
vrg_c3_ps1839_TSD_Products_Command_Reference_Chapter.html#wp1056239
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QUESTION 144
You issue the show running-config command on a CME router and receive the following partial output:

Examine the output, and use the information you gather to answer the question.
How long can the user pause between digits before CME will attempt to dial? (Select the best answer.)

A.
G.711 alaw
two seconds

B.
G.711 µlaw
four seconds

C.
G.726
six seconds

D.
G.729
eight seconds

E.
iLBC
10 seconds

Explanation:
Given the configuration commands in this scenario, the G.729 codec should be displayed in the call statistics
when a user presses the question mark (?) key twice on the IP phone. The G.729 codec is a high-complexity
compressed codec that consumes bandwidth at a rate of 8 Kbps. Cisco IOS uses the G.729 codec by default
unless you specify a codec by issuing the codec command in dial peer configuration mode. For example, the
codec g729br8 command configures a dial peer to use the G.729 Annex B codec, which adds Internet
Engineering Task Force (IETF)standard voice activity detection (VAD) and comfort noise generation features to
the G.729 codec.
There are two ways that you can verify the codec that is being used on a call from a Cisco IP phone: by
pressing the ? key twice while a call is in progress and by pressing settings> Status > Call Statistics after a call
has been disconnected. Both methods of accessing call statistics display the same information, including the
codec being used by the caller, the codec being used by the receiver, the size of voice packets being
transmitted, the size of voice packets being received, the average amount of jitter on the call, the maximum
amount of jitter on the call, and the number of packets that were discarded by the receiver.
Neither the G.711 a-law codec nor the G.711 µ-law (mulaw) codec will be used by the dial peer. The G.711
codec is an uncompressed, 64Kbps audio codec common to all Voice over IP (VoIP) devices. Two variations of

The user can pause up to 10 seconds between digits dialed before Cisco Unified Communications Manager
Express (CME) will attempt to dial because no other interdigit delay has been configured on the router. The dial
peer command destination-pattern .T is used to indicate any string of up to 32 digits. The T character is used at
the end of a string to instruct the router to wait for the complete dial string to be entered before matching a call
to a dial peer. By default, CME will wait up to 10 seconds for the user to dial a digit after a key has been
pressed.
You can change the CME interdigit delay value for IP phones connected to CME by issuing the timeouts
interdigit seconds command in telephony-service configuration mode, where seconds is the number of seconds
CME should wait between key presses before attempting to route the call. The seconds value can be in the
range from two through 10. The interdigit delay value for CME plain old telephone service (POTS) phones can
be configured in voice port configuration mode.

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/command/reference/cme_cr/
cme_t1ht.html#wp9582813200