DND Not working on Yealink T21 Phones

[AlexanderHanna]

Hi, is anyone else having issues with activating DND from the phone. For some reason I am unable to activate the DND from the phone although it indicates it is on from the phone. However, it does not show that it is on from the 3CX Client. When you call the phone, it rings and does not go to voicemail.

Using V15.5 SP5

I can activate the DND on my Fanvil with no issues.

Any ideas?

Alexander

 

[eddv123]

Hi Alexander,

Firmware would be a good place to start - what are you currently using on the devices ? are they up to date ? remember we had a new SP release come out recently.

 

[AlexanderHanna]

Yes, they are up to date (52.83.0.20). I am trying to verify it the firmware update broke it.

 

[AlexanderHanna]

I just downgraded to firmware 52.82.0.20 and the DND on the phone still does not work. I am now thinking it must have happen with v15.5 SP5 update. This is via SBC, which I don't think should make a difference.

 

[phonemaster]

I just downgraded to firmware 52.82.0.20 and the DND on the phone still does not work. I am now thinking it must have happen with v15.5 SP5 update. This is via SBC, which I don't think should make a difference.

Hi AlexanderHanna,
Update your phones back to 52.83.0.20 due that it's always better to have the latest supported version.
I found something about Yealink T21 E2 phones here:
https://www.3cx.com/community/threads/issue-with-3cx-webclient-after-update.57068/

Try the solution provided by YiannisH_3CX:
Please navigate to Settings / Parameters and search for "CSTA_USER_AGENTS"
Copy the value to a file just in case something goes wrong and replace it with the following values:

Fanvil X,Fanvil C400,Fanvil C600,Fanvil H,Htek UC8,Htek UC9,snom3,snomD,snom7,snom8,Yealink SIP-T19P_E2,Yealink SIP-T19_E2,Yealink SIP-T21P_E2,Yealink SIP-T21_E2,Yealink SIP-T23,Yealink SIP-T27,Yealink SIP-T29,Yealink SIP-T4,Yealink SIP-T5,Yealink SIP-CP920,Yealink SIP-CP960,GrandStream GXP2170,GrandStream GXP2160,GrandStream GXP2140,GrandStream GXP2135,GrandStream GXP2130,GrandStream GXP17,GrandStream GXP16

Restart all services and let me know if that works.

I compared these values with my existed values of "CSTA_USER_AGENTS" parameter and found that "Yealink SIP-T21P_E2" and "Yealink SIP-T21_E2" are missed in my existed value and YiannisH_3CX provided a solution for it (as you can see in his code they are available).

I know that the DND synchronization between 3CX and Yealink phones is made by using the CSTA, so probably this is source of your problem.
Try his solution and it can fix your problem.

 

[YiannisH_3CX]

I concur with @phonemaster on this one as this looks like it is causing your problem. Try adding your phone in the list of CSTA agents and see if that resolves the issue.

Note: This only applies for Yealink T21 users and not for other phone models.

 

[AlexanderHanna]

Thanks @phonemaster