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Exam 300-815 topic 1 question 153 discussion

Actual exam question from Cisco's 300-815
Question #: 153
Topic #: 1
[All 300-815 Questions]

An engineer is implementing survivability for a collaboration environment. The environment is utilizing a centralized Cisco UCM at the headquarters and Cisco IOS-XE gateways in the remote branches. Which action must the engineer take to enable both shared lines and B-ACD for SIP branch phones during a WAN outage?

  • A. Configure mode esrst under voice register global configuration mode.
  • B. Configure mode srst under telephony-service configuration mode.
  • C. Configure mode esrst under voice service voip configuration mode.
  • D. Configure mode esrst under telephony-service configuration mode.
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Suggested Answer: A 🗳️
by john_doe_9999 at Dec. 28, 2023, 2:49 p.m.

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729edae
7 months, 3 weeks ago
Selected Answer: A
I have configured SRST/ESRST for years now. The answer is A. SIP uses the Voice Register Global and ESRST is the default operating mode. Telephony-Service is for SCCP ONLY. Voice Service Voip is for setting Global Voice Configuration/Operation and is not used purely for ESRST/SRST
upvoted 1 times
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rsl4u
10 months, 3 weeks ago
From URL: https://www.cisco.com/c/en/us/td/docs/general/xmart/test-page/sccp_and_sip_srst_admin_guide/enhanced_srst.pdf When you configure Unified E-SRST, it provides the following feature benefits in comparison to the classic Cisco Unified SRST: • Voice Hunt Group • Shared Lines • Mixed Shared Lines (SIP and SCCP Phones) • Hunt Statistics Collection • Mixed Deployment (SIP and SCCP Phones) • Shared Line • BLF • Video • B-ACD
upvoted 1 times
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john_doe_9999
11 months, 4 weeks ago
Selected Answer: A
The correct answer is A A. Configure mode esrst under voice register global configuration mode. esrst is configured under voice register global and is required to support B-ACD B. Configure mode srst under telephony-service configuration mode. SRST does not support B-ACD and is not configured under telephony-service C. Configure mode esrst under voice service voip configuration mode. is not configured under voice service voip (border-element is, but not srst/esrst) D. Configure mode esrst under telephony-service configuration mode. esrst is not configured under telephony-service https://www.cisco.com/c/en/us/td/docs/general/xmart/test-page/sccp_and_sip_srst_admin_guide/enhanced_srst.pdf
upvoted 2 times
john_doe_9999
11 months, 3 weeks ago
To clarify further, since the question mentions SIP phones you would configure eSRST under Voice Register Global. For SCCP you would configure under telephony-service. Devil is in the details.
upvoted 4 times
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