Refer to the exhibit. Which choice describes the purpose of the Cisco ASA 5505 firewall in this design?

The correct answer is D. bind signaling and media to the loopback interface. In this design, the Cisco ASA 5505 is configured to bind both SIP signaling and RTP media streams to a loopback interface. Using a loopback interface as the source for SIP signaling and media provides a stable, always-up IP address that does not depend on a physical interface's s

Supplemental Features and Security

Question

Refer to the exhibit. Which choice describes the purpose of the Cisco ASA 5505 firewall in this design?

Exhibit

Options

Ause of port 5061 for SIP secure
Baccess list allowing the firewall IP
Cip prefix-list to filter the unwanted IP address
Dbind signaling and media to the loopback interface

How the community answered

(48 responses)

A
8% (4)
B
17% (8)
C
4% (2)
D
71% (34)

Explanation

In this design, the Cisco ASA 5505 is configured to bind both SIP signaling and RTP media streams to a loopback interface. Using a loopback interface as the source for SIP signaling and media provides a stable, always-up IP address that does not depend on a physical interface's state. This is a common design pattern in SIP gateway configurations to ensure that SIP REGISTER messages, INVITE signaling, and media streams originate from a consistent IP address, preventing call failures during physical link fluctuations. Option A (port 5061) relates to SIP-TLS/SIPS configuration. Option B (access-list) and Option C (ip prefix-list) describe filtering mechanisms, not the primary architectural purpose shown in the exhibit.

Topics

#Cisco ASA#NAT Traversal#SIP Signaling#RTP Media

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