Calls using Voice over IP across AARNet are significantly cheaper than calls that use the telephone networks supplied by the telecommunications carriers. Voice over IP uses data compression to reduce the load on the AARNet network. Use the Internet rather than a modem to connnect to the remote site if possible.
Long distance calls using VoIP fail, or connect at a very low data rate.
From environments with high background noise , such as rooms dedicated to lift motors, air conditioning plant or computers. These callls appear to the listener to be cutting out, as the high background noise is removed when people are not speaking. The call is still successful, but the effect can be confusing. To places where extremely high quality is required , such as a long distance call to a radio station for an on-air interview. When this noise is then added to the hiss from a radio transmission the level of noise heard by the radio listener is higher than usual.