On inbound calls the phone will only ring once the jump to the next step in the call flow whether it is voicemail or another extension. This issue only happens on Monday, by Tuesday it has resolved itself somehow. This is defiantly a pattern as this is the 3rd Monday this has happened on. All 3 customers are running on Linux Debian 9.
Select Phone.Select Voicemail.Select Call Voicemail.Calling Voicemail. If your voicemail is calling like on this screen, your phone is set up correctly. If not, follow the next few steps.Select Keypad.Enter the Voicemail number and select Call. **004*#Select Dismiss. Select the Voicemail tab. Note: Alternatively, from the phone app, select the Keypad tab > select and hold the 1 key > if prompted, enter your voicemail password > follow the prompts to listen to your messages.

For many businesses and professionals, your voicemail greeting is going to be the first point-of-contact for your customers. This is especially true for service businesses, who often rely on their voicemail to collect information from interested parties.
Thanks for calling Dial-A-Shrink. I can’t come to the phone right now, so after the tone, please leave your name and number, then talk briefly about your childhood and tell me what comes to mind when you hear the following words: orange… mother… unicorn… penis. I’ll get back to you with my diagnosis as soon as possible.