android sip protocol

Session Initiation Protocol (SIP) is a protocol used for initiating, maintaining, modifying, and terminating real-time sessions that involve voice, video, messaging, and other communications applications and services. SIP is widely used for Voice over IP (VoIP) applications and services, including on Android devices.

Android provides built-in support for SIP through the Android SIP API, which allows developers to create VoIP applications that use SIP to initiate and manage calls. Here's how to use the Android SIP API to create a simple SIP application:

1. Set up the SIP stack: Before you can use the Android SIP API, you must set up the SIP stack by creating a SipManager instance and registering a listener to handle SIP events.

2. Register with a SIP server: To use the SIP API, you must register with a SIP server. You can do this by calling the open() method on a SipProfile object that contains your SIP account information.

3. Initiate a call: To initiate a call, create a SipAudioCall object and call the makeCall() method, passing in the destination SIP address.

4. Receive incoming calls: To receive incoming calls, you must register a broadcast receiver to handle the android.net.sip.INCOMING_CALL action. When a call is received, you can answer it by calling the answerCall() method on the SipAudioCall object.

5. Manage calls: Once a call is established, you can use the SipAudioCall object to manage the call, including muting, holding, transferring, and ending the call.

Here's an example of how to use the Android SIP API to make a call:

// Set up the SIP stack
SipManager manager = SipManager.newInstance(context);
SipProfile profile = new SipProfile.Builder("username", "domain")
        .setPassword("password")
        .build();
manager.open(profile);

// Initiate a call
SipAudioCall call = manager.makeAudioCall(profile.getUriString(), "destination", listener, 30);

Note that the Android SIP API requires the android.permission.USE_SIP and android.permission.INTERNET permissions in the app's manifest.