Unanswered calls ring duration

[Evan_Yealink]

Dear Customer,

Good day! Thanks for contacting Yealink technical support, this is Evan.

For your question, this time can be set via Skype for business client on the PC. As shown picture below:
Tools--->Call Forwarding settings--->Unanswered calls will go to:voice mail 20 seconds, click on it to set the time value you want.
   
   

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Best Regards,
Evan You