Which of the following statements is CORRECT about configuring a SIP trunk on the U1900?

Question

Options

• ADifferent domain names can map the same IP address.
• BA domain name can map different IP addresses.
• CDomain names and IP addresses must have a one-to-one mapping relationship.
• DThe domain name must be the same as that configured on the peer device connected to the SIP

• A
  4% (1)
• B
  8% (2)
• C
  71% (17)
• D
  17% (4)

Explanation

On Huawei's U1900 unified communications server, SIP trunk configuration enforces a strict one-to-one mapping between domain names and IP addresses - each domain name must resolve to exactly one IP, and each IP must be associated with exactly one domain name. This prevents routing ambiguity, ensuring the system can unambiguously identify the correct peer when processing SIP signaling.

Why the distractors are wrong:

• A is wrong because two different domain names cannot point to the same IP address on this platform - that would create a many-to-one relationship the U1900 does not support.
• B is wrong for the same structural reason in reverse - one domain name cannot map to multiple IPs, as the system requires a clean, unambiguous single-destination binding.
• D is wrong because the U1900 does not require the domain name to match the peer device's configured domain name; local domain-to-IP mapping is independent of what the remote peer calls itself.

Memory tip: Think of it like a passport system - one person (domain name), one ID number (IP address), no sharing and no duplicates. If either side of that pair gets shared, the border agent (U1900) refuses to process the call.

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