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Refer to the exhibit. A Cisco UCM user with directory number 4401 dials 5507, and the call is routed to a Cisco Unified Border Element. Which IP address will the call be sent to?
Actually the correct answer is A, voice class dpg Completely ignores destination-pattern configured in the dial-peer section and follows preference.
To be sure I build this setup in my lab which confirms my statement.
"The destination-pattern command is required on the outbound dial peer even though matching is not done based on this command." https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/dialpeer/configuration/xe-3s/vd-xe-3s-book/multiple-outBound-dial-peer.html
Allows grouping of outbound dial-peers based on an incoming dial-peer, reducing
existing outbound dial-peer provisioning requirements
• Eliminates the need to configure extra outbound dial-peers that are sometimes
needed as workarounds to achieve desired call routing outcome
• Multiple outbound dial-peers are saved under a new “voice class dpg <tag>”. The
new “destination dpg <tag>” command line of an inbound voip dial-peer
can be used to reference the new dpg (dial-peer group)
• Once an incoming voip call is handled by an inbound voip dial-peer with an
active dpg, dial-peers of a dpg will then be used as outbound dial-peers for an
incoming call
• The order of outgoing call setups will be the sorted list of dial-peers from a dpg,
i.e, the destination-patterns of the outgoing dial-peers is not relevant for selection
Correct answer is A
"Once an inbound dial-peer with a dial-peer group configured is matched the call uses the dial-peer defined in the dial-peer group even if the destination-pattern doesn't match"
https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html#anc23
One of the most tricky questions in whole set.
This part you entered is most important. destination-pattern in dpg is mandatory and without it wouldn't treat dial-peer as valid destination. Although it doesn't match pattern it will select first preference from the list. Thus answer will be A.
It would be enough if they would change preference 1 with dial-peer not having destination-pattern and the answer will be completely different.
The example in this document is similar to the test question.
https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html#anc23
Here is another reference. The example in this document is similar to the test question.
https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html#anc23
10.0.0.3 is correct
Snippet from Cisco: "Once an incoming call is matched by an inbound dial peer with an active destination dial-peer group, dial peers from this group are used to route the incoming call. No other outbound dial-peer provisioning to select outbound dial peers is used.
A preference can be defined for each dial peer in a dial-peer group"
I think the right answer is "10.0.0.3" according dial-peer preference list under voice class dpg 2000. Even the closest match is another different dial-peer but as this is a preference list, it will stop looking until a match is found.
if it was not for the voice class dpg 2000 it would be 10.0.0.4. I tested on my lab gateway and you are right, 10.0.0.3 is preferred.
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