350-801 · Question #316
Which two protocols are proxied over an Expressway-E/C pair when a MRA login including phone services is performed? (Choose two.)
The correct answer is B. HTTPS E. SIP. Mobile and Remote Access (MRA) through Cisco Expressway-E/C supports only SIP-registered endpoints (not SCCP or H.323). When a phone logs in via MRA with phone services enabled, two protocols are proxied: (1) SIP - for call signaling between the remote endpoint and Cisco UCM…
Question
Which two protocols are proxied over an Expressway-E/C pair when a MRA login including phone services is performed? (Choose two.)
Options
- ASCCP
- BHTTPS
- CH.323
- DSRTP
- ESIP
How the community answered
(31 responses)- A3% (1)
- B87% (27)
- C3% (1)
- D6% (2)
Explanation
Mobile and Remote Access (MRA) through Cisco Expressway-E/C supports only SIP-registered endpoints (not SCCP or H.323). When a phone logs in via MRA with phone services enabled, two protocols are proxied: (1) SIP - for call signaling between the remote endpoint and Cisco UCM, and (2) HTTPS - for phone services such as the corporate directory, extension mobility, and configuration file downloads (TFTP is tunneled over HTTPS in MRA). SCCP is not supported for MRA. SRTP handles media encryption but is not a proxied signaling protocol. H.323 is not supported in Expressway MRA deployments.
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