Hi,
Currently I am assigning one instance to each extension like below:

<extension name="us.skypeout">
      <condition field="username" expression="^10(\d{2})$">
        <action application="set" data="skype_instance=$1"/>
      </condition>
      <condition field="destination_number" expression="^(\d{11})$">
        <action application="set" data="hangup_after_bridge=true"/>
        <action application="bridge" data="skypopen/interface${skype_instance}/$
      </condition>
    </extension>

Are there any other ways like to get unused instances from a pool?
I guess it could be something like

condition instance1 available?
bridge instance1
condition instance2 available?
bridge instance2
...

then there could be much more extensions to share skype out.

Could anyone help?

Thanks!
Jian