Been at this for 3 weeks now, hope someone can help.... This started after replacing shared extensions with unique users and updating from an early 2011 git. 

Ring group via "pointer" works fine as it always has. However, answer via callgroup variable intermittently (30-40%) leaves one or mores phone ringing even though the the call was answered at another extension. The darn thing is that I can't reproduce it myself to get a trace. Any help/suggestions greatly appreciated. Phones are SPA962 (UDP) and Bria on iPad (TCP, same problems) and they all stopped ringing when they shared IDs.
Mario G

default.xml ring-group has (abbreviated to save space)------------------:
<group name="home">
<users>
  <user id="100" type="pointer"/>
  <user id="101" type="pointer"/>
..... more users
</users>
      </group>

      

        <group name="work">
<users>
  <user id="200" type="pointer"/>
  <user id="201" type="pointer"/>
</users>
      </group>
    </groups>

Extension----------------------:
  <user id="101">
User:
    <params>
      <param name="password" value="$${default_password}"/>
    </params>
    <variables>
      <variable name="voicemail_domain" value="xxxxxx.com"/>
      <variable name="toll_allow" value="domestic,domestic10,international,local"/>
      <variable name="user_context" value="default"/>
      <variable name="effective_caller_id_name" value="Front Desk"/>
      <variable name="effective_caller_id_number" value="101"/>
      <variable name="outbound_caller_id_name" value="$${outbound_caller_name}"/>
      <variable name="outbound_caller_id_number" value="$${outbound_caller_id}"/>
      <!-- callgroup needed to stop ringing on call pickup  -->
      <variable name="callgroup" value="home"/>
    </variables>
  </user>

Bridge command-----------------:
    <extension name="xxphone">
      <condition field="destination_number" expression="^2920$">
        <action application="bind_meta_app" data="1 b s execute_extension::dx XML features"/>
        <action application="bind_meta_app" data="2 b s record_session::$${base_dir}/recordings/${caller_id_number}.${strftime(%Y-%m-%d-%H-%M-%S)}.wav"/>
        <action application="bind_meta_app" data="3 b s execute_extension::cf XML features"/>
        <!--  Set the sayname variable with the callers name -->  
        <action application="execute_extension" data="2925 XML default"/>
        <!-- Next lines allow control after bridge timeout and hangup after bridge -->
        <action application="set" data="hangup_after_bridge=true"/>
        <action application="set" data="continue_on_fail=true"/>
<action application="set" data="ringback=file_string://${xxsounds}hi-long.wav!${sayname}!tone_stream://${us-ring};loops=-1"/>
        <!-- ring extensions only for ## seconds -->
        <action application="bridge" data="{originate_timeout=17}${group_call(home@${domain_name}+A)}"/>