To make a PJSIP call, play music, and hang up using the PJSIP library in a VoIP application, you will need to implement the necessary steps to initiate the call, play the music, and terminate the call. Below is a high-level outline of the steps involved:

  1. Initialize PJSIP Library: Start by initializing the PJSIP library in your application. Set up the necessary configuration, endpoints, and accounts to establish SIP connections.

  2. Register Accounts: Register your SIP accounts with the SIP server to be able to make and receive calls. Use the appropriate credentials and authentication settings for each account.

  3. Place a Call: To initiate a call, create a SIP call using the PJSIP library. Specify the destination phone number or SIP URI of the party you want to call. This will establish a session between your application and the called party.

  4. Play Music: While the call is ongoing, you can play music to the called party using a media stream. The exact implementation may depend on the capabilities of the PJSIP library you are using and the audio file format you want to use for the music. Typically, you'll need to create a media stream and attach the audio file (e.g., MP3 or WAV) to the stream to be played during the call.

  5. Handle Call Events: Implement call event handlers to monitor the call's status and react accordingly. You may want to listen for events like call answered, call hung up, or call failed.

  6. Hang Up Call: When the music playback is complete or you wish to end the call for any reason, you can hang up the call by sending a SIP BYE message to the remote party. This will terminate the call gracefully.

  7. Clean Up Resources: After the call is terminated, make sure to release any resources associated with the call, media streams, and PJSIP library to free up system resources.

Keep in mind that the exact implementation details may vary depending on the specific PJSIP library version and programming language you are using. For a more detailed and step-by-step implementation, refer to the official documentation and examples provided by the PJSIP library you are working with.

Additionally, handling audio streams, media playback, and call events can be complex, so be prepared to deal with potential issues and edge cases. Thoroughly testing your implementation is crucial to ensure proper functionality and reliability of your VoIP application.

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