The following variants are processed by estos ProCall Enterprise software.
+CountrycodeLocationcodeLocationcodePhonenumberExtension
+49815136856177
Function-related separation by blanks, extension separated by hyphen
+49 8151 36856-177
Country Code Area Code Phone Number Extension
+49 8151 36856177
Local area code in brackets, no specifications for the division of subscriber number and extension number
+49 (8151) 36856177