Besides creating an audio file in the right format (Adaptive Multi-Rate), you also need to trick the iPhone to upload your new greeting to the AT&T servers:
4. Call Your Carrier Voicemail Inbox. All cell networks have a voicemail number that you can manually call to access your voicemail inbox. Calling your voicemail number manually can help you determine if your inbox is active and working correctly.
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If you’ve already created a custom voicemail on your iPhone, you can tap Play to see how your voicemail sounds. If you’re interested in creating a new message, tap the Custom button. From here, you can start recording your message by tapping Record and tapping Stop whenever you’re finished. Once you’re finished recording, tap on Play to make sure the message comes across as you’d like and hit Save (in the upper right) to save it as your voicemail.
Qustion: Why is My Voicemail Unavailable on My iPhone? The first reason comes to the settings on the iPhone itself. Your carrier probably restricts your voicemail boxes. Your voicemail box is probably full. The software glitches on your iPhone after new iOS update.
Yeastar Mobility Extension allows you to stay in contact with colleagues and clients using either office phone or mobile phone with the same extension number.
Chatted with CS team. They initially said it’s not possible, then asked me to try #004#. Unfortunately that didn’t work either. They said they would get back to me. Not having visual voice mail is so so inconvenient. Was hoping google voice can save me from depression of switching to service that doesn’t have VVM, but not having much luck …
3. Select “Settings,” then find and select the call-forwarding or forwarding settings option. Possibly found under “More Settings,” or “Advanced.”
To change the voicemail greeting on your iPhone, use the steps in this help page - Visual voicemail - iPhone. Specifically -. Update your greeting. Tap Voicemail, tap Greeting, tap Custom, then tap Record. Or, to use your carrier’s generic greeting, tap Default. Thanks for using Apple Support Communities. Be well.
3. Activate or deactivate One-Touch Access. When you call your voicemail from your phone from anywhere on the Nationwide Sprint® Network, One-Touch Access allows you to access your voicemail without having to enter your passcode.
And then you can tap on the "Enter a new voicemail password" option, the popup numeric keypad will appear on your screen, then you can tap in a new voicemail password. It must contain 4-7 digits.
Website: https://support.line2.com/hc/en-us/articles/203499273-How-to-record-a-custom-voicemail-greeting-on-Android
When an extension user is unavailable, the voicemail greeting consists of 3 audio clips: Unavailable Prompt + Voicemail Prompt + "Di".
One of the best and quick fix to this issue is to turn off Wi-Fi for once and switch to Cellular data connection and then try to change the default greeting to custom on iPhone.
4. When you're ready to begin recording, tap on "Record" and begin speaking. Once you begin recording, you'll see the line turn red. This indicates how much time you have left.
Change your greeting: Tap Voicemail, then tap Greeting.Change your voicemail password: Go to Settings > Phone > Change Voicemail Password, then enter the new password. Change the alert for new voicemail: Go to Settings > Sounds & Haptics or Settings > Sounds.
2. Setting Up an AT&T Voicemail by Calling: Open your iPhone's Phone app. It's the white phone icon on a green background on the Home screen. Tap "Voicemail".
Website: https://support.sparklight.com/hc/en-us/articles/1500006715142-Working-With-Voicemail