sets the value of the extension property . concode_field_sep String number concode_elem_sep String areaCode concode_elem_sep String extension concode_elem_sep String countryCode concode_elem_sep long serialVersionUID concode_elem_sep String internationalAccessCode concode_elem_sep String fullNumber concode_field_sep void setCountryCode concode_elem_sep String getNumber concode_elem_sep String getCountryCode concode_elem_sep String getAreaCode concode_elem_sep String getExtension concode_elem_sep String getFullNumber concode_elem_sep void setFullNumber concode_elem_sep void setAreaCode concode_elem_sep void setInternationalAccessCode concode_elem_sep String getInternationalAccessCode concode_elem_sep void setNumber
void function ( String arg0 ) { this . extension = arg0 ; }