To make international calls from a mobile number or Teams number, follow these steps:

• Dial the + sign or the code 00:
  On most phones, if you hold down the 0, the + sign appears; alternatively, you can always dial 00.
• Add the country prefix:
  Each country has a specific prefix. For example, Germany's prefix is 49, the United States' is 1, etc.
• Dial the phone number:
  Enter the phone number you wish to call.

To make international calls from a Cisco number, you need to add a preliminary step to all above:

• Dial the code 0:
  With this code, you indicate to the CallCenter your intention to dial an external number.

Remember that international calls are not enabled on all numbers by default, and a justified request from the administrative officer designated for telephony services through this support service is necessary to enable them.