<!-- ##### SECTION Title ##### -->
Cancellations

<!-- ##### SECTION Short_Description ##### -->


<!-- ##### SECTION Long_Description ##### -->
<para>

</para>


<!-- ##### SECTION See_Also ##### -->
<para>

</para>


<!-- ##### SECTION Stability_Level ##### -->


<!-- ##### FUNCTION tracker_cancel_call ##### -->
<para>

</para>

@client: 
@call_id: 
@Returns: 


<!-- ##### FUNCTION tracker_cancel_last_call ##### -->
<para>

</para>

@client: 
@Returns: 


