The term DIAL IN is composed of two words: SOAP and TONE. SOAP stands for Session Initiation Protocol, which is a communications protocol used to initiate and manage interactive user sessions over the internet. TONE stands for Telephone TONE, which is a type of audio signal used in telephone systems to indicate the status of a call or to provide information to the user. Together, these two words form the term DIAL IN, which is a method of connecting to a computer network or other device remotely using a telephone line.