Firmware for GXP1610/1615/1620/1625/1628/1630 released as Beta



Dear Grandstream Customers,

Firmware for GXP1610/GXP1615/GXP1620/GXP1625/GXP1628/GXP1630 is now released as Beta. Here is the link for the release notes:

The firmware and release notes can be downloaded from:

Please contact us should you have any issues. Thank you for your support for Grandstream products.

Technical Support
Grandstream Networks, Inc.



is now almost aligned with the older brothers :slight_smile: on all models still missing the “BLF” key to display the active forwards, then become all technically valid and commercially marketable and competitive


Are you sure you have enabled the new P26009 to P26014?
If I’m not mistaken, I don’t work.
n.b.: I tried it on a GXP1625


I think that “Hide/Disable REJECT Key” via code P8511 does not work, it only works if set manually via web.


Hi damiano70,
Looks like I am able to provision these P values fine. Could you please check if there is any other error in the config file that’s causing the P values not take effect?



hi @grandstream
as far as the “Hide/Disable REJECT Key” works, I was wrong.
As for the “P” P26009 to P26014, in my opinion they don’t work, I also opened a ticket.
Even if you enter the codes #72 etc… manually nothing happens at all, it’s as if this new feature is not active.


I wanted to report a bug about a service that you have implemented but that does not work (in my opinion very useful, if it works)
P26009 to P26014 on GXP21XX phones work regularly, but the same settings on GXP16XX do not work. I think it’s an obvious bug.
To sum up:
on GXP21XX phones by correctly setting codes P26009 to P26014, when a deviation from the menu is made from the phone, the deviation (Feature Codes disabled) appears correctly on the screen.
instead on GXP16XX phones correctly setting the codes P26009 to P26014, when you make a deviation from the menu from the phone, does not appear correctly on the screen the deviation (Feature Codes disabled).
Since the firmware GXP16XX is in beta, it is obvious that there may be anomalies, I will report this anomaly so that you can report it for resolution.


(I also opened a ticket for this problem)

the attached screen shows that on GXP21XX the symbol appears, so it works, on GXP16XX it does not appear, therefore codes P26009 to P26014 do not work.