How to change ring times for Ring group?

[ZACK_queue]

Dear Sir or Madam.

I have a question about FreePBX version 15.0.37.
I cannot find a setting to change the ring time for incoming call groups.
Even though I have changed various settings, the system enters voicemail guidance roughly 15 seconds after the ringtone sounds.
I want to set the ring time for incoming call groups to 30-40 seconds.
Do you know a good way to do it?

I am Japanese and my English is not good, but I would appreciate your help.

[shahin (Shahin N)]

Hi @ZACK_queue
Do you mean Ring Group? increase Ring Time (max 300 sec)?

Or Conferences settings?

[ZACK_queue]

Dear @shahin
Excuse me for repeating myself.
My issue resolved.
The cause was the time was set too short in the answering machine setting of the application used as an IPphone.

Thank you for giving me a solution and time for me.
It helped me a lot.