The following variants are processed by estos ProCall Enterprise software.

Super-canonical

+CountrycodeLocationcodeLocationcodePhonenumberExtension

+49815136856177

DIN 5008

Function-related separation by blanks, extension separated by hyphen

+49 8151 36856-177 

E.123

Country Code Area Code Phone Number Extension

+49 8151 36856177 

Microsoft-Style

Local area code in brackets, no specifications for the division of subscriber number and extension number

+49 (8151) 36856177