How do the Cisco Expressway-C and Expressway-E servers transmit media to each other?

The correct answer is A. RTP and RTCP are multiplexed for all internal and external video endpoints across the traversal. Between Expressway-C and Expressway-E, RTP and RTCP media streams are multiplexed together across the traversal zone. This means multiple media streams from different calls and different endpoints share a small set of UDP ports on the traversal link, which is essential for…

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ARTP and RTCP are multiplexed for all internal and external video endpoints across the traversal
BWhen the Expressway-C receives RTP and RTCP media, it establishes a new UDP socket with
CRTP and RTCP are multiplexed for all internal and external video endpoints across the traversal
DWhen the Expressway-E receives RTP and RTCP media, it establishes a new UDP socket with

How the community answered

(30 responses)

A
93% (28)
C
3% (1)
D
3% (1)

Explanation

Between Expressway-C and Expressway-E, RTP and RTCP media streams are multiplexed together across the traversal zone. This means multiple media streams from different calls and different endpoints share a small set of UDP ports on the traversal link, which is essential for efficient firewall traversal. Expressway does not open individual per-call UDP sockets between the pair for each stream (which would require many firewall ports). This multiplexing behavior is a core feature of the Expressway traversal architecture. Answer A correctly describes this multiplexed media handling.

Topics

#Expressway-C#Expressway-E#RTP/RTCP Multiplexing#Media Transmission

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