conf/dialplan/default.xml for the group:
<extension name="group_dial_support">
<condition field="destination_number" expression="^2001$">
<action application="set" data="call_timeout=20"/>
<action application="set" data="continue_on_fail=true"/>
<action application="set" data="hangup_after_bridge=true"/>
<action application="bridge" data="group/support@${domain_name}"/>
<action application="answer"/>
<action application="sleep" data="2000"/>
<action application="voicemail" data="default 2600"/>
</condition>
</extension>
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