Grandstream WP820 IP Phone Firmware 1.0.7.15

ENHANCEMENT

- Added Feature Key Synchronization [FEATURE KEY SYNCHRONIZATION]
- Added Berlin and Dublin into time zone list
- Added device memory info into one-click-debug package
- Added 5G Wi-Fi channels [144-165] support for Netherlands
- Added allow transfer calls to LDAP contacts [TRANSFER TO LDAP CONTACTS]
- Added Wi-Fi Security mode WPA enterprise (802.1x) to web UI [WPA ENTERPRISE (802.1X)]
- Added Language package download via provisioning [LANGUAGE PACKAGE PROVISIONING]

BUG FIX

- Fixed ACK is not being sent to the right port of the server when record-route exist
- Fixed Certificate chain validation failure with custom CA certificate for provisioning
- Fixed "Enable Video Call" still can accept video call
- Fixed When the transfer time out, the phone shows an exception and no response after pressing hang up button
- Fixed Phone sends new INVITE upon "503 Service Unavailable" if the SIP server domain name has an IPv6 address
- Fixed Setting the Multicast Paging Codec to Opus does not take effect
- Fixed Uncheck "Enable Video Call," the phone still prompts audio/video call when calling
- Fixed The cancel button on the video zoom interface is occasionally invalid
- Fixed When set Option 66 to "Preferred, failback when failed" with empty address under option66, the same configuration file will request the web address twice
- Fixed Vibrate does not stop while line is ring muted
- Fixed Response "sendrecv" for video when receive re-invite without SDP from server
- Fixed When G722 codec is used there is no HD indicator
- Fixed Plugging headset during calls does not switch the MIC
- Fixed AVS crash issue when doing conference bridge
- Fixed Not showing video stream during video call in early media scenario
- Fixed Constraint mode: Wi-Fi and Bluetooth can still be turned ON-OFF from LCD without admin password
- Fixed Some alias config options have wrong logic
- Fixed After a call is cancelled, there is no sound when answering another call as the called party 

About VoIP Phone Updates:

Firmware updates for VoIP Phones are very important as they usually contain many bug fixes, add new features and updates, as well as add additional security features.

One of the main problems users come across when attempting to upgrade their VoIP Phone is that their device may be locked to a certain Carrier. Adding an unlocked version of the firmware may cause the device to stop working on certain networks. This operation may void your carrier warranty and, as such, is not recommended.

Before downloading, make sure that you have selected the appropriate firmware for your device and that the update supports the VoIP service provider you use.

Generally, it is important to upgrade older firmware in sequence (v1 to v2 to v3) and so on, because many manufacturers don't launch standalone update packages.

Although using beta release firmware packages is tempting, it can prove to be quite risky as well. If you choose to try beta release updates, please read the detailed firmware notes and make sure that you have the possibility to revert to an older and more stable version in case the beta turns out faulty.

If you feel that this update can improve the functionality of your VoIP Phone, please use the download button and follow the installation instructions.

  It is highly recommended to always use the most recent driver version available.

Try to set a system restore point before installing a device driver. This will help if you installed an incorrect or mismatched driver. Problems can arise when your hardware device is too old or not supported any longer.