By VOIP if you mean "Voice over Internet Protocol" then VOIP is a protocol optimized for the transmission of voice through the Internet or other packet switched networks. Then testing will be carried out to check
- How the Voice is transmitted through the Internet for its clarity.
- For its features such as forwarding, automatic redial, and caller ID.
- For the ability to transmit more than one telephone call using the broadband-connected
telephone line
- For the Secure calls using standardized protocols here the testing will be to check how the call to encrypt and authenticate the existing data stream.

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