diff --git a/doc/call-states.dia b/doc/call-states.dia
new file mode 100644
index 0000000..d7b6729
--- /dev/null
+++ b/doc/call-states.dia
@@ -0,0 +1,1556 @@
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+        <dia:color val="#ffffffff"/>
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+        <dia:composite type="dict"/>
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+        <dia:point val="14.226,43.4114"/>
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+        <dia:real val="1.5"/>
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+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
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+      <dia:attribute name="fill_colour">
+        <dia:color val="#ffffffff"/>
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+      <dia:attribute name="obj_bb">
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+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
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+        <dia:boolean val="true"/>
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+      <dia:attribute name="text_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="trigger">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="-11.4989,36.4168"/>
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+      <dia:attribute name="guard_text_pos">
+        <dia:point val="-11.4989,37.4168"/>
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+        <dia:boolean val="false"/>
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+        <dia:point val="15.0029,41.3466"/>
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+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="14.2394,40.2538;15.5029,43.411"/>
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+      <dia:attribute name="meta">
+        <dia:composite type="dict"/>
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+        <dia:point val="15.0029,41.3466"/>
+        <dia:point val="15.0029,42.3538"/>
+        <dia:point val="14.976,42.3538"/>
+        <dia:point val="14.976,43.361"/>
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+      <dia:attribute name="orth_orient">
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
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+      <dia:attribute name="orth_autoroute">
+        <dia:boolean val="true"/>
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+      <dia:attribute name="text_colour">
+        <dia:color val="#000000ff"/>
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+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="trigger">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="14.4894,40.8538"/>
+      </dia:attribute>
+      <dia:attribute name="guard_text_pos">
+        <dia:point val="14.4894,41.8538"/>
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+        <dia:boolean val="false"/>
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+        <dia:connection handle="1" to="O12" connection="8"/>
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+        <dia:point val="13,32.9"/>
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+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-11.5,30.8212;13.05,35.05"/>
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+      <dia:attribute name="meta">
+        <dia:composite type="dict"/>
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+      <dia:attribute name="orth_points">
+        <dia:point val="13,32.9"/>
+        <dia:point val="-11,32.9"/>
+        <dia:point val="-11,35"/>
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+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
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+      <dia:attribute name="orth_autoroute">
+        <dia:boolean val="true"/>
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+      <dia:attribute name="text_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="trigger">
+        <dia:string>#AnyError (f.e. signal lost, timeout, etc)#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="-4.41461,31.4212"/>
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+      <dia:attribute name="guard_text_pos">
+        <dia:point val="0.5,32.4"/>
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+        <dia:boolean val="false"/>
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+        <dia:connection handle="1" to="O10" connection="1"/>
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+        <dia:rectangle val="-11.5,16.8759;0.0795521,35.0038"/>
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+      <dia:attribute name="meta">
+        <dia:composite type="dict"/>
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+        <dia:enum val="1"/>
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+        <dia:enum val="1"/>
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+        <dia:boolean val="false"/>
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+      <dia:attribute name="text_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="trigger">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="-6.21022,17.4759"/>
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+      <dia:attribute name="guard_text_pos">
+        <dia:point val="-6.21022,18.4759"/>
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+        <dia:boolean val="false"/>
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+        <dia:rectangle val="-11.5,19.5546;15.4933,35.0001"/>
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+      <dia:attribute name="meta">
+        <dia:composite type="dict"/>
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+        <dia:enum val="1"/>
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+        <dia:boolean val="false"/>
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+      <dia:attribute name="text_colour">
+        <dia:color val="#000000ff"/>
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+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="trigger">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="1.49667,20.4611"/>
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+      <dia:attribute name="guard_text_pos">
+        <dia:point val="1.49667,21.4611"/>
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+        <dia:boolean val="false"/>
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+      <dia:attribute name="meta">
+        <dia:composite type="dict"/>
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+        <dia:point val="26.2334,21.9478"/>
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+        <dia:boolean val="false"/>
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+        <dia:color val="#000000ff"/>
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+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
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+      <dia:attribute name="trigger">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
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+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="-11.5,22.9239"/>
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+      <dia:attribute name="guard_text_pos">
+        <dia:point val="-11.4497,24.0239"/>
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+        <dia:boolean val="false"/>
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+      <dia:attribute name="meta">
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+        <dia:point val="16.9933,18.7046"/>
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+        <dia:boolean val="true"/>
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+        <dia:color val="#000000ff"/>
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+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
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+      <dia:attribute name="trigger">
+        <dia:string>#PeerAlerted#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
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+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
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+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="25.1389,17.8046"/>
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+        <dia:point val="22.1764,18.2046"/>
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+        <dia:color val="#000000ff"/>
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+      <dia:attribute name="trigger">
+        <dia:string>#CallHungUp#</dia:string>
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+      <dia:attribute name="guard">
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+        <dia:point val="1.74955,19.8148"/>
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+        <dia:color val="#000000ff"/>
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+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
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+      <dia:attribute name="trigger">
+        <dia:string>#AnswerCall#</dia:string>
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+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
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+        <dia:string>##</dia:string>
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+        <dia:point val="8.58943,28.5832"/>
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+        <dia:point val="6.87478,28.5"/>
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+        <dia:point val="25,32"/>
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+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="24.95,31.95;29.05,33.85"/>
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+        <dia:point val="25,32"/>
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+        <dia:real val="1.8"/>
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+        <dia:composite type="text">
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+            <dia:string>#HELD#</dia:string>
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+          <dia:attribute name="font">
+            <dia:font family="sans" style="0" name="Helvetica"/>
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+      </dia:attribute>
+      <dia:attribute name="line_width">
+        <dia:real val="0.10000000000000001"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="fill_colour">
+        <dia:color val="#ffffffff"/>
+      </dia:attribute>
+    </dia:object>
+    <dia:object type="UML - Transition" version="2" id="O23">
+      <dia:attribute name="obj_pos">
+        <dia:point val="28.3594,22.8973"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="14.5,22.8473;28.8594,31.9995"/>
+      </dia:attribute>
+      <dia:attribute name="meta">
+        <dia:composite type="dict"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="28.3594,22.8973"/>
+        <dia:point val="28.3594,28.9616"/>
+        <dia:point val="15,28.9616"/>
+        <dia:point val="15,31.9495"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="orth_autoroute">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="trigger">
+        <dia:string>#PeerAcceptCall#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="19.614,28.1207"/>
+      </dia:attribute>
+      <dia:attribute name="guard_text_pos">
+        <dia:point val="21.1797,28.4616"/>
+      </dia:attribute>
+      <dia:attribute name="direction_inverted">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O9" connection="8"/>
+        <dia:connection handle="1" to="O7" connection="8"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Transition" version="2" id="O24">
+      <dia:attribute name="obj_pos">
+        <dia:point val="17,32"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="16.95,30.4;25.05,32.5"/>
+      </dia:attribute>
+      <dia:attribute name="meta">
+        <dia:composite type="dict"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="17,32"/>
+        <dia:point val="21,32"/>
+        <dia:point val="21,32"/>
+        <dia:point val="25,32"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="orth_autoroute">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="trigger">
+        <dia:string>#SecondaryCallAccepted#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="21,31"/>
+      </dia:attribute>
+      <dia:attribute name="guard_text_pos">
+        <dia:point val="20.5,31.5"/>
+      </dia:attribute>
+      <dia:attribute name="direction_inverted">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O7" connection="2"/>
+        <dia:connection handle="1" to="O22" connection="0"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Transition" version="2" id="O25">
+      <dia:attribute name="obj_pos">
+        <dia:point val="25,33.8"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="16.535,32.7;25.465,35.2"/>
+      </dia:attribute>
+      <dia:attribute name="meta">
+        <dia:composite type="dict"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="25,33.8"/>
+        <dia:point val="21,33.8"/>
+        <dia:point val="21,33.8"/>
+        <dia:point val="17,33.8"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="orth_autoroute">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="trigger">
+        <dia:string>#SecondaryCallDisconnected#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="21,35"/>
+      </dia:attribute>
+      <dia:attribute name="guard_text_pos">
+        <dia:point val="20.5,33.3"/>
+      </dia:attribute>
+      <dia:attribute name="direction_inverted">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O22" connection="5"/>
+        <dia:connection handle="1" to="O7" connection="7"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Transition" version="2" id="O26">
+      <dia:attribute name="obj_pos">
+        <dia:point val="7.73533,12.3716"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="1.24955,11.1022;7.78533,18.0648"/>
+      </dia:attribute>
+      <dia:attribute name="meta">
+        <dia:composite type="dict"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="7.73533,12.3716"/>
+        <dia:point val="1.74955,12.3716"/>
+        <dia:point val="1.74955,18.0148"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="orth_autoroute">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="trigger">
+        <dia:string>#IncomingCall#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="3.44777,11.7022"/>
+      </dia:attribute>
+      <dia:attribute name="guard_text_pos">
+        <dia:point val="4.24244,11.8716"/>
+      </dia:attribute>
+      <dia:attribute name="direction_inverted">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O2" connection="3"/>
+        <dia:connection handle="1" to="O5" connection="1"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Transition" version="2" id="O27">
+      <dia:attribute name="obj_pos">
+        <dia:point val="27,32"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-11.5,23.9;27.5,34.9998"/>
+      </dia:attribute>
+      <dia:attribute name="meta">
+        <dia:composite type="dict"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="27,32"/>
+        <dia:point val="27,26"/>
+        <dia:point val="-11,26"/>
+        <dia:point val="-11,34.9498"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="orth_autoroute">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="trigger">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="7.5,24.5"/>
+      </dia:attribute>
+      <dia:attribute name="guard_text_pos">
+        <dia:point val="7.5,25.5"/>
+      </dia:attribute>
+      <dia:attribute name="direction_inverted">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O22" connection="1"/>
+        <dia:connection handle="1" to="O10" connection="8"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Transition" version="2" id="O28">
+      <dia:attribute name="obj_pos">
+        <dia:point val="12.2003,12.3716"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="12.1503,11.2704;17.3227,17.8546"/>
+      </dia:attribute>
+      <dia:attribute name="meta">
+        <dia:composite type="dict"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="12.2003,12.3716"/>
+        <dia:point val="14.9933,12.3716"/>
+        <dia:point val="14.9933,17.8046"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="orth_autoroute">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000ff"/>
+      </dia:attribute>
+      <dia:attribute name="trigger">
+        <dia:string>#PlacingCall#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="action">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="guard">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="trigger_text_pos">
+        <dia:point val="15.5777,11.8704"/>
+      </dia:attribute>
+      <dia:attribute name="guard_text_pos">
+        <dia:point val="13.0968,11.8716"/>
+      </dia:attribute>
+      <dia:attribute name="direction_inverted">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O2" connection="4"/>
+        <dia:connection handle="1" to="O8" connection="1"/>
+      </dia:connections>
+    </dia:object>
+  </dia:layer>
+</dia:diagram>