H11-811 · Question #76
A company has purchased an U1911 working as an IP PBX, and the command for batch adding phone numbers is executed to add extension numbers 600X (X is a variable). After the configuration, two IP…
The correct answer is B. The intra-office prefix 6 is not added. Option B is correct because on the Huawei U1911 (and similar IP PBX systems), an intra-office prefix tells the PBX how to recognize and route calls between internal extensions. Without the prefix "6" configured, the system doesn't know that dialing "6001" should be treated as…
Question
A company has purchased an U1911 working as an IP PBX, and the command for batch adding phone numbers is executed to add extension numbers 600X (X is a variable). After the configuration, two IP phones with extension numbers 6000 and 6001 successfully register with the U1911 but fail to place calls with each other. What is the most possible cause of this problem?
Options
- AThe outgoing prefix 6 is not added.
- BThe intra-office prefix 6 is not added.
- CThe U1911 encounters a power outage.
- DPhones connected to the U1911 must have call services activated before placing calls.
How the community answered
(42 responses)- A12% (5)
- B76% (32)
- C7% (3)
- D5% (2)
Explanation
Option B is correct because on the Huawei U1911 (and similar IP PBX systems), an intra-office prefix tells the PBX how to recognize and route calls between internal extensions. Without the prefix "6" configured, the system doesn't know that dialing "6001" should be treated as an internal call - so even though both phones registered successfully, the PBX can't route calls between them.
Why the distractors are wrong:
- A (outgoing prefix): An outgoing prefix applies to calls leaving the PBX toward external lines (PSTN). Since 6000 and 6001 are calling each other internally, outgoing routing is irrelevant here.
- C (power outage): A power outage would prevent registration entirely - but the scenario explicitly states both phones registered successfully, ruling this out.
- D (call service activation): Successful SIP/H.323 registration on an IP PBX inherently enables call capability; there is no separate per-phone "call service activation" step required on the U1911.
Memory tip: Link the prefix type to the call direction - intra = inside (internal calls between extensions), outgoing = outside (calls to the PSTN). If phones register but can't reach each other, the intra-office prefix is the missing piece.
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