Subject: [Megaco] A new problem : should the signal be stopped after subtract(with no signal discriptor)

From: [email-masked]
Date: Thu, 21 Apr 2005 16:28:32 +0800

Hello:
 
   This days we come across a problem:

      1, physical terminate agw0 is in context 1 ,and it is onhook and it 
is playing ring-signal
      2, MGC send a subtract cmd to delete the physical terminate to NULL 
context ,
         but there is no signal discriptor in the cmd :
         !/1 [10.29.60.81]:2944
          T=1{
            C=1{S=*}
             }
      3, should the signal be stopped?

  In Rfc 3525 7.1.11  at the end of page[53]   The subtract cmd is 
descripted as follow: 
 
   When a provisioned Termination is Subtracted from a Context, its
   property values shall revert to:

   -  the default value, if specified for the property and not
      overridden by provisioning;
   -  otherwise, the provisioned value.
 
  but We do not know whether signal is a property of a termination?
  And there is no definition in Rfc 3525 about this  (may be we have not 
found it yet) 

   In Rfc 3525  7.1.11 page[38]   there presents 4 conditions when a 
signal is stopped:

  Finally, the optional parameter "notifyCompletion" allows a MGC to
   indicate that it wishes to be notified when the signal finishes
   playout. The possible cases are 
(1)that the signal timed out (or otherwise completed on its own), 
(2)that it was interrupted by an event,
(3)that it was halted when a Signals descriptor was replaced, 
(4)or that it stopped or never started for other reasons. 
   If the notifyCompletion parameter is not included in a Signals 
descriptor, notification is
   generated only if the signal stopped or was never started for other 
reasons. 

  It seems to be that "subtract" cmd with no "signal  discriptor" do not 
belongs to the upper 4 cases.
  Then the signal should not be stopped  .
 
  Is it Right? Alcatel's Engineers seems to have different opinions . 
Please give us a reply ! We are confused about This.

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