3. Force close and reopen the Phone app. To force close Phone, on iPhone X and later swipe up until you see the apps in task view, then swipe up again on Phone.
Website: https://shoretelcommunity.force.com/s/article/How-to-Manage-Your-Voicemail-Greetings-Using-a-Cisco-Phone

Make sure that you set up your voicemail. To check, dial your own phone number from your iPhone and leave yourself a message. Call your iPhone from another phone and try to leave yourself a voicemail. Go to the keypad and press and hold on the 1, or press the Call Voicemail button. This dials voicemail. Check if you have any missed messages.
"The High Representative noted that while disagreements still persisted, the EU and China needed to continue engaging intensively in a number of important areas," the EU said, adding Borrell underscored the inclusive and cooperative character of Europe's Indo-Pacific strategy. The EU is taking a softer stance on China, one of its most important trade partners, than the United States which has struck a new security deal (AUKUS) with Britain and Australia that is widely seen as designed to counter China's growing assertiveness in the Pacific.