210-065 · Question #258
Your customer has an EX60 at a home-office that is doing direct H.323 dialing. When they place calls to remote sites, they report that they cannot see video or hear audio from the remote sites. What…
The correct answer is A. NAT mode is not configured on the EX60. A home-office EX60 performing direct H.323 dialing behind a NAT router will not pass media correctly unless NAT mode is configured, because remote endpoints cannot reach the private IP addresses advertised in H.245 media negotiation.
Question
Your customer has an EX60 at a home-office that is doing direct H.323 dialing. When they place calls to remote sites, they report that they cannot see video or hear audio from the remote sites. What is most likely the cause of this issue?
Options
- ANAT mode is not configured on the EX60.
- BThe HDMI cable that connects the EX60 to the monitor is not plugged in.
- CA username and password must be configured on the EX60.
- DQoS is not properly configured on the EX60.
How the community answered
(22 responses)- A73% (16)
- B5% (1)
- C14% (3)
- D9% (2)
Why each option
A home-office EX60 performing direct H.323 dialing behind a NAT router will not pass media correctly unless NAT mode is configured, because remote endpoints cannot reach the private IP addresses advertised in H.245 media negotiation.
When the EX60 is behind NAT, it advertises its private IP address in H.245 capability exchange; the remote site sends media to this unreachable private address, resulting in no audio or video received - enabling NAT mode on the EX60 causes it to use the public IP address in signaling so media can be delivered correctly.
An unplugged HDMI cable would prevent the local user from seeing video on their monitor but would not affect the remote site's ability to receive audio or video from the EX60.
Username and password credentials are used for endpoint registration or administration, not for establishing direct H.323 media sessions between endpoints.
Incorrect QoS configuration would degrade media quality or cause packet loss, but would not completely block both audio and video in both directions as described.
Concept tested: NAT traversal configuration for H.323 home-office endpoints
Source: https://www.cisco.com/c/en/us/support/collaboration-endpoints/telepresence-ex-series/products-installation-and-configuration-guides-list.html
Topics
Community Discussion
No community discussion yet for this question.