By default, the interval for refreshing the registered SIP server is set to ()s on an IP phone.

Question

Options

• A360
• B1200
• C600
• D120

• A
  9% (5)
• B
  5% (3)
• C
  84% (46)
• D
  2% (1)

Explanation

Option C (600 seconds) is correct because most IP phones - including Huawei devices, which this question targets - default to a 600-second (10-minute) SIP re-registration interval, the value defined as standard in common vendor implementations and aligned with typical SIP RFC recommendations for balancing network load and registration freshness.

• 360 (A) is wrong - it has no standard basis in SIP implementations; it may seem plausible as a "round" interval but is not a vendor default.
• 1200 (B) is wrong - while some deployments use longer intervals, 1200s is not the factory default; it would leave registrations stale for too long before renewal.
• 120 (D) is wrong - though 120s is sometimes used in keep-alive or heartbeat contexts, it is too frequent for a registration refresh default and would generate unnecessary signaling overhead.

Memory tip: Think "600 = 10 minutes = a coffee break" - the phone checks in with the server once per coffee break by default, making it easy to remember as a practical, network-friendly interval.

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