H11-861_V4.0 Questions and Answers

In SFU+IAU mode, the IAU’s re-encoded (decoded and encoded) streams are identified by the MpAdaptStrmNo value under Site(18). In the output, MpAdaptStrmNo[2710124429803] is the stream number carrying all three re-encoded video channels.

The Via header tracks each hop of the request and is used to guide the response back along the same path.

SIP relies on SDP for session description in multimedia calls; it cannot negotiate media parameters independently of SDP.

The SMC indeed provides six built-in user roles (system administrator, security administrator, security auditor, program administrator, conference administrator, and common user), but their default permissions are fixed and cannot be modified or removed.

The collaboration hardware platform implements full redundancy: network ports, fans, power supplies, and disks (RAID) - to ensure high availability and fault tolerance.

4CIF (704×576) at 30 fps gives 704 × 576 × 30 ≈ 12.17 million pixels/s. At 48 bits per pixel, that’s 12.17 M × 48 ≈ 584 Mbit/s, which is nearest to 600 Mbit/s.

H.225 RAS messages (registration, admission, status) always traverse the SC (gatekeeper) for endpoints in the same zone.

RTP media is exchanged directly between T1 and T2 once the call is established.

The call control sequence involves H.225 RAS (registration/admission), H.225 call signaling (SETUP/CONNECT), and H.245 control for capabilities.

The CloudRSE web interface exports its configuration in XML format, producing a .xml file for import or backup.

If the input volume falls below the echo canceller’s detection threshold, the device can’t identify and suppress return audio, leading to echoes or squealing.

An audio loop, where output is fed back into the input, directly causes echo and feedback noise.

Placing the microphone too close to the speaker allows direct pickup of its output, resulting in echo and potential high-pitched feedback.

The H.26x family (H.263, H.264/AVC, H.265/HEVC) was designed with low-latency, real-time encoding/decoding in mind (ideal for videoconferencing and streaming calls) whereas MPEG-1/2/4 were originally optimized for file-based storage (VCD/DVD), broadcast and progressive streaming. Modern deployments often blend these. For example, using H.265 for both live calls and high-efficiency streaming and newer standards (like H.266/VVC) are now emerging.

In the conference site list, Site 18 corresponds to T3 and its remote media IP ([RmtMedIp]) is listed as 172.23.132.76.

The Via header records each hop a request takes and is used to route the corresponding response back along the same path.

An RRQ conveys the endpoint’s network address information (IP address and associated port number) along with its H.323 ID alias to the gatekeeper for registration.