Yealink VCM38 Administrator's Guide

| Configuring Call Settings | 210
2. Configure and save the following settings:
Parameter Description Configuration Method
Video Call Rate
Configure the maximum video
call rate.
Default: 2000kb/s.
Web user interface
Endpoint
CTP20/CTP18
Configuring Call Rate Adaptation
The call rate adaptation feature is enabled by default. When the network bandwidth is less than the
specified call rate, the endpoint will adaptively modify the sending resolution and frame rate to lower the
sending rate during a call. In some network environments, if the sending rate is lowered, the sending
resolution and frame rate cannot be restored due to call rate adaptation. You need to disable the call rate
adaptation feature to place calls at a specified rate. Disabling the call rate adaptation feature can avoid the
situation that the bandwidth cannot be recovered after packet loss.
Procedure
1. On your web user interface, go to Setting > Call Features > Outbound Call Settings.
2. Configure and save the following settings:
Parameter Description Configuration Method
Call Rate Adaptive
Enable or disable the call rate
feature.
Default: On.
Web user interface
Account Polling
Account polling feature allows the system to use different call types (Cloud platform/H.323 account/SIP
account/PSTN account) to dial a number when more than one account is registered. If account polling is
disabled, the system can only dials a number by using the call type with the highest priority. That is, once
the dialed number differs from the call type with the highest priority you are using, you cannot place a call.
Example
1. System A is registered with a Yealink Cloud account and a SIP account.
2. Select the call type automatically. Dial the number.
• If account polling is enabled, system A will use its Cloud account (highest priority) to call system B
first. If this call fails, system A continues to use its SIP account (the second highest priority) to call
system B.
• If account polling is disabled, system A can only use its Cloud account (highest priority) to call
system B. SIP account can not be used to call out.
Note: This feature is not applicable to IP call.
• Priority of Call Types
• Configuring the Account Polling

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