You may use the IDD service as follows that suit your needs:
(1) Calling from a fixed line:
(a) Dial 001 > country code > area code (if applicable) > phone number
(b) Dial 0060 > country code > area code (if applicable) > phone number
(2) Calling from a fax number:
(a) Dial 002 > country code > area code (if applicable) > phone number
(b) Dial 0062 > country code > area code (if applicable) > phone number
(3) Call from a mobile phone number
(a) Dial 0060 > country code > area code (if applicable) > phone number