Variance in the arrival time of components in a packet of information is called Jitter. Jitter is more disruptive for Internet Telephony than many of the above-mentioned situations. This delay adds to the packet delay from other causes. There are several methods whereby users can utilize Internet Telephony. An example of the cost of using Internet Telephony with the three methods is shown below for an overseas call to South Asia.
Quality can be good if both users have fairly high bandwidth.
Cost includes the fee for the PSTN phone Gateway at the destination. The cost includes fees for PSTN Gateway at the call origination and destination locations. For casual non-business users Internet Telephony is here now. For small business users, it may be used if the sound quality is acceptable. Large business users are still taking a wait and see attitude.