VoIP Voice and Fax Signal Processing

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CALLER ID FEATURES IN VoIP

Caller identity delivery (CID) is a member of the custom local-area signaling services (CLASS) family of telephone services offered by local telephone companies. CLASS services vary by the service provider. Caller ID is one of the most popular call services. Caller ID, which is also known as calling number delivery (CND), is a method of transmitting telephone caller information, such as telephone number and/or caller name. In a public switched telephone network (PSTN), the terminal receiving the call features is referred to as terminal equipment (TE). In most PSTN applications, the telephone is the TE. The customer premises equipment (CPE) name is also used in place of TE. In general, the call features description makes use of the names TE and CPE from the PSTN service. In VoIP, the CPE name is used for the VoIP adapter, Internet Protocol (IP) phone, wireless fidelity (WiFi) handset, and so on. In VoIP, deployment infrastructure, VoIP CPEs, and telephones used with CPE to establish call features. Two primary methods of caller ID delivery services are normal caller ID and call wait ID (CWCID). Normal caller ID happens during the on-hook phase of the phone. It is also known as Type-1 caller ID. Call wait ID or call wait caller ID is displayed in the middle of the on-going call. It happens in the off-hook state of the phone. Call wait caller ID is known as Type-2 caller ID. Depending on the country, governing local standards, and central office (CO) switch ...