title: Asterisk configuration for getting Notify to the BLF
body: <p>i am trying to configure Asterisk server to get NOTIFICATION for BLF.
  I get NOTYFY for the SUBSCRIBE at the time of REGISTER but at the time of Running call for the busy user ,no NOTIFY is sent from the Asterisk server.</p>
  
  <p>The Sip.conf File setting is as below:</p>
  
  <pre><code>[1111]
  type=friend
  username=1111
  secret=1111
  context=dialplan    
  host=dynamic    
  canreinvite=no    
  disallow=all    
  allow=ulaw    
  allow=alaw    
  transport=udp    
  qualify=no    
  dtmfmode=inband    
  encryption=no    
  nat=no    
  mailbox=11@voicemail    
  subscribecontext=BLF
  call-limit=20
  
  [2222]    
  type=friend    
  username=2222    
  secret=2222    
  context=dialplan    
  host=dynamic    
  canreinvite=no
  disallow=all
  allow=ulaw
  allow=alaw
  transport=udp
  qualify=no
  dtmfmode=inband
  encryption=no
  nat=no
  </code></pre>
  
  <p>and the Extensions.conf file is as below:</p>
  
  <pre><code>[BLF]
  exten =&gt; 1111,hint,SIP/1111
  exten =&gt; 2222,hint,SIP/2222
  exten =&gt; 3333,hint,SIP/3333
  </code></pre>
  
  <p>In the Above setting, i need Notification For user 2222 on User 1111.
  Pls help.</p>