300-710 · Question #256
Remote users who connect via Cisco AnyConnect to the corporate network behind a Cisco FTD device report that they get no audio when calling between remote users using their softphones. These same…
The correct answer is C. FTD has no NAT policy that allows outside to outside communication. For remote users connected via AnyConnect VPN behind a Cisco FTD device, calls between remote users require the FTD to allow traffic between VPN clients, which is considered "outside to outside" traffic since VPN clients are logically on the outside interface. Without a proper…
Question
Remote users who connect via Cisco AnyConnect to the corporate network behind a Cisco FTD device report that they get no audio when calling between remote users using their softphones. These same users can call internal users on the corporate network without any issues. What is the cause of this issue?
Options
- AThe hairpinning feature is not available on FTD.
- BSplit tunneling is enabled for the Remote Access VPN on FTD
- CFTD has no NAT policy that allows outside to outside communication
- DThe Enable Spoke to Spoke Connectivity through Hub option is not selected on FTD.
How the community answered
(23 responses)- A4% (1)
- B4% (1)
- C83% (19)
- D9% (2)
Explanation
For remote users connected via AnyConnect VPN behind a Cisco FTD device, calls between remote users require the FTD to allow traffic between VPN clients, which is considered "outside to outside" traffic since VPN clients are logically on the outside interface. Without a proper NAT exemption or NAT policy that permits this outside-to-outside communication, the traffic between remote users will be blocked or dropped, causing issues such as no audio during calls. Cisco FTD requires explicit NAT rules to allow such communication; otherwise, the default behavior blocks this traffic. troubleshoot-common-anyconnect-communica.pdf
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