Yealink VCM38 Administrator's Guide

| Configuring Account Settings | 101
Parameter Description Configuration Method
Local Early Media
Enable or disable the local early
media feature on the device.
• Off—the local system sends
an Open Logical Channel
(OLC) message and receives
the acknowledgement
message of OLC from the
far site. After receiving the
acknowledgement message,
the system may transmit RTP
streams to the far site.
• On—the system sends
an OLC message to the
far site and then transmits
RTP streams to the far site
directly before receiving
the acknowledgement
message of OLC. For some
gatekeepers, you need to
enable this feature to avoid
black screen during a call.
Default: Off.
Web user interface
H.323 Tunneling
The tunneling feature relies on H.225 system-to-system connectivity (via TCP) to pass H.245 messages,
and uses the H.225 communication channel without creating a separate TCP socket connection (per H.323
call) for media control. H.323 tunneling is supported by the video conferencing system. To use H.323
tunneling, make ensure the participants in the call enable H.323 tunneling simultaneously. When you log in
to the StarLeaf platform or use an H.323 account, you can configure the H.323 tunneling feature.
Procedure
1. Do one of the following:
• On your web user interface, go to Account > H.323 or Account > VC Platform > Video
Conference Platform > Platform Type > StarLeaf.
• On your VCS, go to More > Settings > Advanced > Account > H.323.
For VP59, tap > Settings > Advanced > Account > H.323.
•
On your CTP20/CTP18, tap > Settings > Advanced > Account > H.323.
2. Configure and save the following settings:
Parameter Description Configuration Method
H.323 Tunneling
Enable or disable the system
to send all signaling and media
through the HTTP tunnel.
Default: Disabled.
Web user interface
Endpoint
CTP20/CTP18

Yealink VCM38 Specifications

General

Type	Conference microphone
Noise reduction	Yes
Microphone frequency	100 - 16000 Hz
Microphone sensitivity	-45 dB
Microphone pick-up range	6 m
Number of microphone arrays	8
Maximum sound pressure level (1kHz)	100 dB
Device interface	RJ-45
Connectivity technology	Wired
Maximum operating distance	40 m
Mounting type	Ceiling
Product color	Silver
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	5 - 90 %
Number of products included	1 pc(s)
Harmonized System (HS) code	85181000
Power source	DC/PoE
Sustainability certificates	CE, Federal Communications Commission (FCC), REACH, RoHS

Weight and Dimensions

Width	127.3 mm
Height	66.3 mm