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:
When recording a personalized voicemail greeting on your office phone, your greeting should include only the company name and your extension number. When recording a personalized voicemail greeting on your office phone, your greeting should include only the company name and your extension number. State your name and spell it out if you’re asking callers to follow up with written correspondence. State your company name and department name. Let callers know that you cannot take their call right now. Invite them to leave a message. What should I record on my work voicemail?
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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.
You’ve reached the voicemail of [your name], [your job title]. I’m currently either away from my desk or on the other line. Please leave your name, telephone number, and a short message after the beep, and I’ll be sure to get back to you as soon as I’m available.” Open the Google Voice app . At the top left, tap Menu. Settings. In the Voicemail section, tap Voicemail greeting. Tap Record a greeting. Tap Record . Record your greeting and when you’re done, tap Stop . Choose what you want to do with the recording: To listen to the recording, tap Play . Should you say your name in your voicemail?
3. Tap the "Voicemail" button in the bottom-right corner of the screen to enter voicemail.
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Visual voicemail is a way to scan and manage your voicemails on your iPhone screen. No more calling up - with visual voicemail you don't have to call a number to get your messages, and you don't have to listen to them in order. Instead, just tap your voicemail icon …
With Visual Voicemail on iOS 9 you can listen to a Voicemail easily and you can also save or send a message on to someone else through iMessage or email.
An extension is a short internal number. Extensions allow users to make and receive calls. You can assign extensions to every employee in your organization.
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You can record a personal greeting, or you can use one of the pre-recorded CenturyLink greetings. Follow the system prompts to select your greeting:
10. Reset Time Zone and set Date & Time automatically. For most users, it’s recommended to let your device automatically set the time. To make sure that your time zone and similar settings are correct
Website: https://forums.att.com/conversations/apple/iphone-8-and-voicemail-custom-greeting-not-working/5df01bbfbad5f2f606f690fd
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Learn how to delete Voicemail messages from your Apple® iPhone® by following these steps.