300-820 · Question #223
300-820 Question #223: Real Exam Question with Answer & Explanation
The correct answer is D: Enable "Accept Replaces Header" on the SIP Trunk security profile on Cisco UCM.. In a Cisco Meeting Server (CMS) cluster, when multiple Call Bridges are involved, call continuity across bridges (especially during load balancing) relies on the use of the Replaces header in SIP signaling. To support this, you must enable "Accept Replaces Header" in the SIP Trun
Question
After an engineer implements load balancing in the Cisco CMS cluster, they observe that shortly after the second Call Bridge is added to the cluster, call into a space randomly disconnect when the calls are from endpoints registered with Cisco UCM. Which action resolves the issue?
Options
- AEnable "Accept Unsolicited Notification" on the SIP Trunk security profile.
- BEnable "Accept Presence Subscription" on the SIP Trunk security profile on Cisco UCM.
- CEnable "Accept Out-of-dialog REFER" on the SIP Trunk security profile".
- DEnable "Accept Replaces Header" on the SIP Trunk security profile on Cisco UCM.
Explanation
In a Cisco Meeting Server (CMS) cluster, when multiple Call Bridges are involved, call continuity across bridges (especially during load balancing) relies on the use of the Replaces header in SIP signaling. To support this, you must enable "Accept Replaces Header" in the SIP Trunk Security Profile on Cisco UCM. Without this setting, inter-bridge call transfers can fail, causing calls to
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