Which two protocols are proxied over an Expressway-E/C pair when a MRA login including phone services is performed? (Choose two.)
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A. B. C. D. E.BE.
When a mobile remote access (MRA) login is performed and phone services are included, certain protocols are proxied over an Expressway-E/C pair. The two protocols that are proxied are SIP and HTTPS.
SIP (Session Initiation Protocol) is a signaling protocol used to establish, modify, and terminate multimedia sessions such as voice and video calls over IP networks. When a MRA login including phone services is performed, SIP traffic is proxied over the Expressway-E/C pair to provide secure remote access to phone services.
HTTPS (Hypertext Transfer Protocol Secure) is a protocol used for secure communication over the internet. When a MRA login including phone services is performed, HTTPS traffic is proxied over the Expressway-E/C pair to provide secure access to web-based applications such as the Cisco Unified Communications Manager (CUCM) Self Care Portal and the Cisco Jabber Guest web interface.
The other options listed in the question are not proxied over an Expressway-E/C pair when a MRA login including phone services is performed:
SCCP (Skinny Client Control Protocol) is a protocol used for communication between Cisco IP phones and CUCM. However, SCCP traffic is not proxied over an Expressway-E/C pair during MRA login with phone services.
H.323 is a protocol used for video conferencing over IP networks. However, H.323 traffic is not proxied over an Expressway-E/C pair during MRA login with phone services.
SRTP (Secure Real-Time Transport Protocol) is a protocol used to provide secure voice and video communication over IP networks. However, SRTP traffic is not proxied over an Expressway-E/C pair during MRA login with phone services.