sip cases a detailed description of a reference can help I want to know the SIP protocol!

SipDemo
.......\.classpath
.......\.project
.......\AndroidManifest.xml
.......\assets
.......\bin
.......\...\classes
.......\...\.......\com
.......\...\.......\...\example
.......\...\.......\...\.......\android
.......\...\.......\...\.......\.......\sip
.......\...\.......\...\.......\.......\...\IncomingCallReceiver$1.class
.......\...\.......\...\.......\.......\...\IncomingCallReceiver.class
.......\...\.......\...\.......\.......\...\R$attr.class
.......\...\.......\...\.......\.......\...\R$drawable.class
.......\...\.......\...\.......\.......\...\R$id.class
.......\...\.......\...\.......\.......\...\R$layout.class
.......\...\.......\...\.......\.......\...\R$strin.class
.......\...\.......\...\.......\.......\...\R$string.class
.......\...\.......\...\.......\.......\...\R$xml.class
.......\...\.......\...\.......\.......\...\R.class
.......\...\.......\...\.......\.......\...\SipSettings.class
.......\...\.......\...\.......\.......\...\WalkieTalkieActivity$1.class
.......\...\.......\...\.......\.......\...\WalkieTalkieActivity$2.class
.......\...\.......\...\.......\.......\...\WalkieTalkieActivity$3.class
.......\...\.......\...\.......\.......\...\WalkieTalkieActivity$4.class
.......\...\.......\...\.......\.......\...\WalkieTalkieActivity$5.class
.......\...\.......\...\.......\.......\...\WalkieTalkieActivity$6.class
.......\...\.......\...\.......\.......\...\WalkieTalkieActivity$7.class
.......\...\.......\...\.......\.......\...\WalkieTalkieActivity.class
.......\...\res
.......\gen
.......\...\com
.......\...\...\example
.......\...\...\.......\android
.......\...\...\.......\.......\sip
.......\...\...\.......\.......\...\R.java
.......\proguard.cfg
.......\project.properties
.......\res
.......\...\drawable-hdpi
.......\...\.............\ic_launcher.png
.......\...\drawable-ldpi
.......\...\.............\ic_launcher.png
.......\...\drawable-mdpi
.......\...\.............\btn_record.xml
.......\...\.............\btn_speak_normal.png
.......\...\.............\btn_speak_pressed.png
.......\...\.............\btn_speak_selected.png
.......\...\.............\ic_launcher.png
.......\...\.............\icon.png
.......\...\layout
.......\...\......\call_address_dialog.xml
.......\...\......\walkietalkie.xml
.......\...\values
.......\...\......\strings.xml
.......\...\xml
.......\...\...\preferences.xml
.......\src
.......\...\com
.......\...\...\example
.......\...\...\.......\android
.......\...\...\.......\.......\sip
.......\...\...\.......\.......\...\IncomingCallReceiver.java
.......\...\...\.......\.......\...\SipSettings.java
.......\...\...\.......\.......\...\WalkieTalkieActivity.java

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