If you have access to Avaya Manager software you can change this under the voicemail tab by selecting the user or group required and clicking voicemail. There you will find a timer that is calculated in seconds, as a rough guide we use the 15 second rule which equals approx. 4 to 5 rings.
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For further assistance with your phone system, please click here to contact our Convergecom Service team to speak with an Avaya Technician.