ChatGPT:

It is possible for a computer to send an audio message to a telephone extension within a telephone system. This can be achieved through various methods:

1. VoIP (Voice over Internet Protocol): Using software or APIs, a computer can send audio messages through VoIP technologies. There are platforms and APIs available that allow programmatically sending audio messages to telephone numbers, including specific extensions.

2. Automated Phone Systems: Computers can interact with telephone systems through automated phone systems (IVR - Interactive Voice Response). These systems can be programmed to deliver pre-recorded audio messages to specific extensions.

3. Telephony APIs: Many telephony service providers offer APIs that enable developers to send audio messages programmatically to telephone extensions. These APIs often provide various functionalities to handle calls and deliver messages.

4. Email-to-Voice Services: Some services allow you to convert an email message to a voice message that can be sent to a phone number, including extensions.

In each case, the specific method and APIs used might vary depending on the telephony system and the capabilities it offers for sending audio messages to extensions.