350-801 · Question #270
An administrator configures Cisco UCM to use UDP for SIP signaling and finds that an endpoint cannot make calls. Which action resolves this issue?
The correct answer is A. Change the phone security profile.. In Cisco UCM, the Phone Security Profile defines the transport protocol (UDP, TCP, or TLS) used for SIP signaling between the phone and UCM. If UCM is set to use UDP but the phone's assigned security profile specifies TCP or TLS (or vice versa), the phone will fail to register an
Question
An administrator configures Cisco UCM to use UDP for SIP signaling and finds that an endpoint cannot make calls. Which action resolves this issue?
Options
- AChange the phone security profile.
- BChange the SIP dial rules.
- CChange the SIP profile
- DChange the common phone profile.
How the community answered
(36 responses)- A78% (28)
- B6% (2)
- C3% (1)
- D14% (5)
Explanation
In Cisco UCM, the Phone Security Profile defines the transport protocol (UDP, TCP, or TLS) used for SIP signaling between the phone and UCM. If UCM is set to use UDP but the phone's assigned security profile specifies TCP or TLS (or vice versa), the phone will fail to register and cannot make calls due to a transport protocol mismatch. Changing the Phone Security Profile (A) to match the configured transport (UDP) resolves the mismatch. Option B (SIP dial rules) controls number formatting for outbound dialing, not transport. Option C (SIP profile) governs SIP timers, options, and features - not the transport layer. Option D (common phone profile) handles features like DND and phone services, not transport protocol settings.
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