The telephone expense was featured by the local phone cost, mobile phone cost, long domestic phone cost and oversea phone cost. The total of the telephone expense was 422,661.12 baht. The top three ranking of the highest user were as following;
Ranking 1 CEO & COO Office at amount of 131,694.90 baht (13.70%)
Ranking 2 Customer Service Department at amount of 61,003.50baht (6.34%)
Ranking 3 Human Resource at amount of 58,391.10 baht (6.07%)
Central Number (for Fax & Rental Number Fee) 422,661.12 baht (43.96%)
Breakdown detail of Telephone Expense 2012 from billing system