Grandstream DP750 IP Phone Firmware 1.0.13.8

ENHANCEMENT

- Added support for handsets to internally page other handsets without accounts registered on menu -> Call features -> paging.
- Added support to enable or disable “On Hold Reminder Tone” in Web UI. [ON HOLD REMINDER TONE]
- Added support to configure “Caller ID Display” in Web UI.
- Updated some Chinese translations.
- Updated the CPE to 1.0.1.141 to better support GDMS.

BUG FIX

- Fixed DP7xx changes hold status to incoming call status when remote also hold the call.
- Fixed DP7xx handsets failed to ring during paging call.
- Fixed DP7xx web UI option “Authenticate Conf File” does not take effect after enabled under provision setting page.
- Fixed DP7xx drops call when 100REL is enabled and using 183 session progress on some platform.
- Fixed DP7xx handset softkey button failed to display “Cancel” when making a second call and the first call hang up by remote during the second call is in ringing.
- Fixed DP7xx intercom all only support attended transfer, while there is a blind transfer menu.
- Fixed DP7xx 16, 17 feature code not functioning issue.
- Fixed DP7xx some dial plan setting does not take effect.
- Fixed DP7xx handsets display “call released 512” instead of “line busy” when callee reject the call.
- Fixed DP7xx still able to send out INVITE when account is not registered and “Outgoing Calls Without Registration” is enabled.
- Fixed DP72x/DP730 still display call “Held” after end a held conference call to a single call.
- Fixed DP75x auto reboot after change SIP Transport from TLS to UDP with Custom TLS cert and key.
- Fixed DP75x cannot make intercom call when dial plan is set to { [ x]+ }.
- Fixed DP75x SNMP trap and trap interval do not take effect with trap version 3.
- Fixed DP75x hold reminder tone does not play after enabled the reminder tone on web UI option.
- Fixed DP75x base station may crash after provisioned by 3CX server and idled for a period of time.
- Fixed DP7xx randomly rejects incoming calls with 486 busy.
- Fixed when DP72x/DP730 is holding the call, if the remote also hold the call, the handset will falsely display a second incoming call UI.
- Fixed DP7xx handsets time cannot be updated in real time after base station time be updated.
- Fixed DP7xx send ACK for the 200OK after the re-INVITE REFER, the ACK will lead NETSAPIENS server response 491 and transfer failed.
- Fixed DP7xx dial plan working as expected issue such as {<=1>x.} and {<=1>x+} were not recognized.
- Removed invalid account status from SSH UI.
- Fixed DP72x and DP730 still retained custom LSK menu after device being factory reset.
- Fixed DP72x and DP730 still shows call in “Held” status after it has been transferred.
- Added support for “’” and “_” in Contacts search box.
- Fixed DP7xx still receives PTT after enabled DND.
- Fixed DP72x and DP730 issue that when it is in ringing status, and receives another incoming call, it replies 486 busy to the second call but not generates a missed call notice.
- Fixed DP72x and DP730 issue that it still prompt missed call after viewed them in “All Calls” and rebooted.
- Fixed DP72x and DP730 cannot display the local-stored contact name when received incoming to a parallel mode account.
- Fixed DP7xx intercom call will fail if the SIP proxy is configured.
- Fixed DP72x and DP730 RSK display as “Silent” instead of “Open” when receiving GDS calls that the caller ID is stored in Contacts. 

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.