For the members with the group call delayed ring feature configured, the audible ringing delays up to the configured time, but the lights start flashing immediately.

You can specify the delayed ring time from 1 to 30 seconds. Zero is the default value, which disables the delayed ring. If you disable the delayed ring, you cannot set it for the group members.

After enabling the delayed ring, you can select it for each member. You can also select a delayed ring for all the members simultaneously.