title: limit number of watchers in asterisk BLF/subscriptions
body: <p>Our asterisk have been taking toll since number of subscriptions are too many. </p>
  
  <p>is there is way to limit "watchers"</p>
  
  <p>I have looked on internet but nothing specifically touches this topic of limiting number of subscriptions. </p>
  
  <p>E.g. </p>
  
  <p>Only max of 3 phones can subscribe to BLF/monitor to phone 001</p>
  
  <p>Below is part output from our console.</p>
  
  <pre><code>asterisk -rx 'core show hints'
  
  641@25550094-Default    : SIP/6172      State:Idle            Watchers  7
  
  643@25550094-Default    : SIP/6172      State:Idle            Watchers  7
  
  279@25790053-Default    : SIP/6128      State:Idle            Watchers  5
  
  777@81560062-DEFAULT    : SIP/6188      State:Unavailable     Watchers  1
  
  799@81560105-DEFAULT    : SIP/6188      State:Unavailable     Watchers  0
  
  387@81560085-DEFAULT    : SIP/6187      State:Idle            Watchers  8
  
  683@81560037-DEFAULT    : SIP/6188      State:Unavailable     Watchers  0
  
  544@81560083-DEFAULT    : SIP/6188      State:Unavailable     Watchers  0
  
  001@25550042-Default    : SIP/6129      State:Idle            Watchers 13
  
  002@25550042-Default    : SIP/6129      State:Idle            Watchers 13
  </code></pre>