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
I know I last Choose Option "D" as the answer, but after researching more detailly, I come to the conclusion that Option "A" is the correct answer.
Explanation:
Once an INBOUND dial-peer with a dial-peer group configured is matched(Incoming called-number 5T), the call uses the dial-peer defined in the dial-peer group even if the destination-pattern does not match:dial-peer 2001 preference 1(destination-pattern 5506)
Dial-peer grouping feature. A group of dial-peers can be made a part of a dial-peer group under a “voice class dpg <tag>”
“destination dpg <tag> will be used to reference a dial-peer group from an incoming dial-peer
Once an incoming dial-peer is matched. The dial-peers which are a part of the dpg defined under it will be used for outbound dial-peer matches on the particular call.
The dial-peer preference command does not influence inbound dial peer selection when there are multiple dial peers with the same match criteria that could be selected, based on the ingress VoIP signaling message. CUBE uses the concept of the longest and most specific match to determine the priority.
Now, When attempting to route a call and perform an outbound dial peer selection, IOS uses the logic dictated by the dial-peer hunt command to determine which dial peer of a given match criteria should be used. The default configuration for dial-peer hunt is 0, which indicates “Longest match in phone number, explicit preference, random selection.” As this suggests, the concept of longest, most specific match applies to outbound dial peers just as it applies to inbound dial peers. In those conditions, the correct answer is C, 10.0.0.4
Correct Answer: C. 10.0.0.4
Explanation:
The configuration provided in the exhibit includes multiple dial peers. When a call is made, the destination pattern of the dialed number is matched against the configured dial peers to determine the appropriate session target.
The user dials 5507.
The dial peer configuration includes:
dial-peer voice 2001 with pattern 5506.
dial-peer voice 2002 with pattern 55...
dial-peer voice 2003 with pattern 5507.
The destination pattern 5507 matches exactly with dial-peer voice 2003, which has the session target ipv4:10.0.0.4.
Thus, the call to 5507 will be sent to the IP address 10.0.0.4.
I´m new to this so maybe this is an stupid post with an even more stupid question:
Do the system check all the patterns looking for a match? Or do it takes the first match option in the list as the correct one and then send the call?
If it looks all the patterns the correct answer is C as confirmed by the users.
But if it follows the order looking for the 1st match... "55.." pattern should be a match and the target IP would be option B.
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"
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