New Configuration Wise 
1. Student Module Configuration Name - StudentContactNoDigitValidation
2. Employee Module Configuration Name - EmployeeContactNoDigitValidation

Value in Configguration - Numeric Value 

Student Side Affected Pages 
https://test.onlinevidyalaya.net/Pages/StudentManagement/Communication.aspx
https://test.onlinevidyalaya.net/Pages/StudentManagement/StudentAllDetails.aspx
https://test.onlinevidyalaya.net/Pages/StudentManagement/StudentDetailUpdate.aspx
https://test.onlinevidyalaya.net/Pages/StudentManagement/StudentDataUpdate.aspx
https://test.onlinevidyalaya.net/Pages/BaseFramework/Utilities/ImportStudent.aspx
https://test.onlinevidyalaya.net/Pages/BaseFramework/Utilities/ImportStudentOldDetail.aspx
https://test.onlinevidyalaya.net/Pages/BaseFramework/Utilities/ImportStudentDynamic.aspx