Push signal delivery status judging apparatus and method

A computer-readable, non-transitory medium storing a program for causing a computer to execute a procedure for judging delivery status of a push signal, the procedure comprising:

• receiving packets flowing in a specific session between a transmission source and transmission destination at an arbitrary point on a route of the specific session, and storing the received packets into a storage device, wherein the packets include voice packets and non-voice packets representing the push signal;
• first judging based on sequence numbers included in the received packets stored in the storage device, whether or not packet loss has occurred in the specific session;
• and
• upon detecting that the packet loss has occurred, second judging, according to status of the packet loss and predetermined characteristics of the non-voice packets, whether or not loss of the push signal has occurred.