Grandstream GSC35x6 Firmware Release Notes

Firmware Version 1.0.5.22

Product Name

GSC3506/GSC3516

Date

7/31/2025

Firmware File Information

Firmware file name: gsc35x6fw.bin
MD5: a56ef523e4405e05a0273d2e6f2e2ab8

Changes Since Firmware Version 1.0.5.20

Enhancement

Security version of the phone is now displayed on WebUI
Updated "Minimum TLS Version", "Enable/Disable Weak Ciphers", "Web Access Mode", and "Enable Direct IP Call" default values to be more secure
Improved security by increasing SSH public key length to 2048 bits

Firmware Version 1.0.5.20

Product Name

GSC3506/GSC3516

Date

2/18/2025

Firmware File Information

Firmware file name: gsc35x6fw.bin
MD5: 654cde1af6376026e9038ed664a13d93

Changes Since Firmware Version 1.0.5.15

Bug Fix

Fixed an issue where sometimes the audio heard at the end of the previous call can be heard at the beginning of the new call
Fixed an issue where there is noticeable delay when using playback cascade with GSC3505/GSC3506 as master and GSC3506/GSC3516 as slave
Fixed an issue with inconsistent audio quality from multicast paging
Fixed a security vulnerability

Firmware Version 1.0.5.15

Product Name

GSC3506/GSC3516

Date

10/18/2024

Firmware File Information

Firmware file name: gsc35x6fw.bin
MD5: f65cc0f8d129dc5ba8dc7212cb72de75

Changes Since Firmware Version 1.0.5.8

Enhancement

Added support for Apple AirPlay and Miracast[AIRPLAY&MIRACAST]
Added support for disabling the bootup tone[DISABLE BOOTUP TONE]
Added support for provisioning the blocklist/allowlist from GDMS

Bug Fix

Fixed an issue where the device could hang when trying to parse empty UTF-8 messages

New Features Overview

Airplay&Miracast

Web Configuration

These options can be found on the web UI under Network Settings -> Airplay&Miracast.

Functionality

Configures whether to support Airplay and Miracast.

P-Value Configuration

P-Value	Description	Value Range	Default
P22382	Airplay	0 - No 1 - Yes	0
P22383	Miracast	0 - No 1 - Yes	0
P22560	Projection Name	Max 64 characters
P22561	Pin Code	Max 16 numbers

Firmware Version 1.0.5.15 (Continued)

Disable Bootup Tone

Web Configuration

These options can be found on the web UI under System Settings -> Preferences -> Audio Control.

Functionality

Configures whether to play a sound effect when the device boots up.

P-Value Configuration

P-Value	Description	Value Range	Default
P22486	Enable Bootup Tone	0 - No 1 - Yes	1

Firmware Version 1.0.5.8

Product Name

GSC3506/GSC3516

Date

04/30/2024

Firmware File Information

Firmware file name: gsc35x6fw.bin
MD5: d14a29f5d68c8cd5e75e8a9ad5b2d9cd

Changes Since Firmware Version 1.0.5.7

Enhancement

Added ability to enable/disable "User" web access[ENABLE USER WEB ACCESS]
Disabled the "User" Web UI account by default
Added a prompt to change password when logging in to account "User" for the first time

New Features Overview

Enable User Web Access

Web Configuration

These options can be found on the web UI under System Settings -> Security Settings -> Web/SSH Access.

Functionality

Configures whether to enable web access for account "User".

P-Value Configuration

P-Value	Description	Value Range	Default
P8469	Enable User Web Access	0 - No 1 - Yes	0

Firmware Version 1.0.5.7

Product Name

GSC3506/GSC3516

Date

04/23/2024

Firmware File Information

Firmware file name: gsc35x6fw.bin
MD5: 848fd17895182c2b45ee364611ecb1c9

Changes Since Firmware Version 1.0.5.4

Enhancement

Added ability to disable start and end of multicast tones[MULTICAST TONES]
Added ability to change the LED color for calls during an active call[CALL LIGHT]

Bug Fix

Fixed device bootup issue
Fixed issue where multicast paging sometimes wouldn't work after a reboot due to the binding failing on the first try

New Features Overview

Multicast Tones

Web Configuration

These options can be found on the web UI under Phone Settings -> Call Settings.

Functionality

Configures whether or not you want to play the prompt tones at the start or end of the multicast.

P-Value Configuration

P-Value	Description	Value Range	Default
P22556	Multicast Tone	0 - Disabled	0

End-Call Tone

P-Value Configuration

P-Value	Description	Value Range	Default
P6762	End-Call Tone	1 - Enabled 0 - Disabled	1

Call Light

Web Configuration

These options can be found on the web UI under System Settings -> Preferences -> LED Management.

Functionality

Configures which LED color will be displayed during an active call.

P-Value Configuration

P-Value	Description	Value Range	Default
P22555	Call Light	0 - Green 1 - Yellow 2 - Purple 3 - Cyan 4 - Red 255 - None	0

Firmware Version 1.0.5.4

Product Name

GSC3506/GSC3516

Date

01/22/2024

Firmware File Information

Firmware file name: gsc35x6fw.bin
MD5: 6d406b597b5806640dd5cc523d7ee56c

Changes Since Firmware Version 1.0.3.8

Enhancement

Added pvalue support on the alias template to support UCM Zero Config custom parameters
Updated incorrect Web UI prompts
Improved Chinese translations
Added support for RTP timeout[RTP TIMEOUT]
Added the ability to change the web login timeout value[WEB LOGIN TIMEOUT]

Bug Fix

Fixed an issue where the GSC35x6 wouldn't continue to hear the ringback tone after it receives a 2nd incoming call that gets cancelled
Fixed an issue where the GSC35x6 would use the ringtone volume when playing an alarm if it is receiving an incoming call at the same time as the alarm is playing
Fixed an issue where the user would be logged out of the web UI after sharing music for a long time
Fixed an issue where the CTI command for mute wasn't working
Fixed an issue where the GSC35x6 wasn't using DHCP Option 23 after it received an IPv6 IP address dynamically
Fixed an issue where the whitelist/blacklist would be emptied after uploading a contacts file
Fixed an issue where you can manage the GSC35x6 using GSC Assistant with an incorrect username but correct password
Fixed an issue where the Emergency Group Paging Volume was being used for barged multicast paging calls
Fixed an issue where if the network switches during music playback, then the music will stop playing
Fixed an issue where media could still play even if media volume has been set to 0
Fixed an issue where the call history search was case-sensitive
Fixed an issue on GSC35x6 where echo could appear if calls were left on for a long time

New Features Overview

RTP Timeout

Web Configuration

This option can be found on the web UI under Account -> Account_x -> Codec Settings -> RTP Settings.

Functionality

Configures the RTP timeout of the phone. If the phone does not receive a RTP packet within the specified RTP time, the call will be automatically disconnected. Default range is 6-600. If set to 0, this feature is disabled.

P-Value Configuration

P-Value	Description	Value Range
P29068	RTP Timeout (s) – Account 1	0, 6-600
P29168	RTP Timeout (s) – Account 2	0, 6-600
P29268	RTP Timeout (s) - Account 3	0, 6-600
P29368	RTP Timeout (s) – Account 4	0, 6-600
P29468	RTP Timeout (s) – Account 5	0, 6-600
P29568	RTP Timeout (s) – Account 6	0, 6-600
P53668	RTP Timeout (s) – Account 7	0, 6-600
P53768	RTP Timeout (s) – Account 8	0, 6-600
P53868	RTP Timeout (s) – Account 9	0, 6-600
P53968	RTP Timeout (s) – Account 10	0, 6-600
P54068	RTP Timeout (s) – Account 11	0, 6-600
P54168	RTP Timeout (s) – Account 12	0, 6-600
P54268	RTP Timeout (s) – Account 13	0, 6-600
P54368	RTP Timeout (s) – Account 14	0, 6-600
P54468	RTP Timeout (s) – Account 15	0, 6-600
P54568	RTP Timeout (s) – Account 16	0, 6-600

Web Login Timeout

Web Configuration

This option can be found on the web UI under System Settings -> Security Settings -> Web/SSH Access.

Functionality

Configures login timeout (in minutes) for the user. If there is no activity within the specified time, the user will be logged out, and the Web UI will go to the login page automatically.

P-Value Configuration

P-Value	Description	Value Range	Default
P28116	User Login Timeout	1-60	15

Firmware Version 1.0.3.8

Product Name

GSC3506/GSC3516

Date

06/16/2023

Firmware File Information

Firmware file name: gsc3516fw.bin
MD5: 0784d0cbb9c511350ef567606c8ade7c

Changes Since Firmware Version 1.0.3.4

Enhancement

Updated English Web UI strings
Added support for GSC Assistant[GSC ASSISTANT]
Removed Web UI settings that weren't applicable

Bug Fix

Fixed an issue where GSC wouldn't automatically reconnect to a paired BT device after disconnection
Fixed an issue where GDMS wouldn't be notified of a failed firmware upgrade
Fixed an issue where after setting the BT visibility timeout to Never and rebooting the device, the device wouldn't flash blue to indicate it is visible to other devices
Fixed an issue where the SSH tunnel to the device will show it is still up even though it has expired

New Features Overview

GSC Assistant

Web Configuration

This option can be found on the web UI under Application -> GSC Assistant.

Functionality

Configures the ability for the device to be detectable by the GSC Assistant App and what label it shows up with during the scan.

P-Value Configuration

P-Value	Description	Value Range	Default
22518	Managed by GSC Assistant App	0-No 1 - Yes	1 - Yes
22519	Device Label	String

Firmware Version 1.0.3.4

Product Name

GSC3506/GSC3516

Date

04/03/2023

Firmware File Information

Firmware file name: gsc3516fw.bin
MD5: 24e92e04213031b8e2a3b9ff92cd48e7

Changes Since Firmware Version 1.0.1.29

Enhancement

Remove start and end of multicast tones

Bug Fix

Fixed issue where multiple master devices can exist in the same environment
Fixed issue where IP calls using IPv6 wouldn't work
Fixed issue where music would restart mid play if played after the device reboots
Fixed issue where RTCP reports would not be sent if you didn't specify which port to send it to
Fixed issue where the device could get an IP address from a tagged VLAN and untagged VLAN at the same time
Fixed issue where error prompt didn't display when entering a multicast listening address that doesn't match the requirements
Fixed issue with account swap when swapping with an account from 1-6 and an account from 7-16
Fixed issue where music files with commas in their name couldn't be played
Fixed issue where you couldn't get an IP address when using PPPoE and VLAN
Fixed issue where you couldn't get the time in an IPv6 environment
Fixed issue where greylist password constraints weren't strict enough
Fixed issue where if a contact name is too long, it will be displayed as 2 separate calls instead of 1 call
Fixed issue where if you switch away from the Music page while playing Online Music, the Web UI eventually times out and the music stops playing

	Grandstream GSC3505/GSC3510 Firmware Release Notes Comprehensive release notes detailing firmware updates, enhancements, and bug fixes for Grandstream GSC3505 and GSC3510 devices across various firmware versions, including configuration details and P-values.
	Grandstream GWN70xx Wireless Router Firmware Release Notes Official release notes for Grandstream GWN70xx series wireless routers, detailing firmware versions, file information, and changes/enhancements for each release.
	Grandstream GWN70xx Wireless Router Firmware Release Notes Official release notes for Grandstream GWN70xx series wireless routers, detailing firmware versions, updates, bug fixes, and new features for models GWN7062, GWN7052, and GWN7052F. Includes important upgrading information and download links.
	Grandstream GXV3240/GXV3275 Firmware Release Notes Comprehensive release notes detailing firmware updates, new features, enhancements, and bug fixes for Grandstream GXV3240 and GXV3275 IP Video Phones.
	Grandstream WP816/WP826/WP836 Firmware Release Notes Release notes for Grandstream WP816, WP826, and WP836 devices, detailing firmware versions, enhancements, and bug fixes.
	Grandstream GWN771x Firmware Release Notes Detailed release notes for Grandstream GWN771x series light managed switches, covering firmware versions, download information, and changes/enhancements for each release.
	Grandstream WP816/WP826/WP836 Firmware Release Notes Comprehensive release notes for Grandstream WP816, WP826, and WP836 devices, detailing firmware updates, enhancements, bug fixes, and new features across various versions.
	Grandstream WP810/WP822/WP825 Firmware Release Notes This document provides detailed release notes for Grandstream WP810, WP822, and WP825 firmware updates, including version history, enhancements, bug fixes, and new features.