**6.3 Emergency communication between operators**

After the earthquake, communication among NOCs was difficult because the fiber break disrupted VoIP and legacy telephone service. Moreover, the earthquake happened on December 26th 2006, overlapping with the Christmas holiday. Thus, all the communication was routed over the instant messaging system and e-mails were routed over the detoured network even though it provided poor quality service. It became obvious that the emergency communication should be guaranteed in case of failures so that the recovery process can be started quickly
