300-070 · Question #70
Refer to the exhibit and configuration output. A user in New York (5001) is trying to call a user in London (6001), but the call cannot be completed. Assuming that the WAN uplink is failing and the…
The correct answer is B. prefix 757385. When a call to London (extension 6001, matching destination-pattern 6...) must failover from the WAN to the PSTN, the router needs to prepend the full PSTN routing digits before the dialed number. The dial peer destination-pattern '6...' matches only the 4-digit internal…
Question
Refer to the exhibit and configuration output. A user in New York (5001) is trying to call a user in London (6001), but the call cannot be completed. Assuming that the WAN uplink is failing and the voice traffic has to go out toward the PSTN, which command do you need to add to dial peer to solve this issue? dial-peer voice 3 pots destination-pattern 6... preference 1 port 0/0/0:23 dtmf-relay sip-notify
Exhibit
Options
- Anum-exp 512602 6001
- Bprefix 757385
- Cforward-digits 2
- Dforward-digits 4
- Eprefix 5126
How the community answered
(25 responses)- A8% (2)
- B44% (11)
- C32% (8)
- D4% (1)
- E12% (3)
Explanation
When a call to London (extension 6001, matching destination-pattern 6...) must failover from the WAN to the PSTN, the router needs to prepend the full PSTN routing digits before the dialed number. The dial peer destination-pattern '6...' matches only the 4-digit internal extension. To route via PSTN, the gateway must send the full PSTN number to the carrier. The 'prefix 757385' command prepends '757385' to the matched digits before sending them out the POTS interface, constructing the complete PSTN-routable number (e.g., 7573856001). The 'forward-digits' commands only control how many digits are forwarded, not whether a prefix is added. 'num-exp' is for number expansion in CUCM/CME, not on a POTS dial peer.
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