Re: KeepActive flag in signal

Chen,
 
The signals with KeepActive continue to play while the new signals are being applied (simultaneously).
Please note that multiple signals can be played simultaneously on a termination. This is rarely needed
(as opposed to sequential signal list) and protocol supports it.
One such case I can think of is, an analog line getting (constantly active, i.e. KeepActive) a normal/reverse Plarity 
Signal while ringing or ringback (or any call progress tone) signal is applied to that termination.
 
- Raju


  _____  

From: [email protected] [mailto:[email protected]] On Behalf Of Chen, Hao SNLB PEK
Sent: Wednesday, May 07, 2008 10:36 PM
To: [email protected]
Cc: Li, Ling Juan SLC Com PEK
Subject: [Megaco] KeepActive flag in signal


Hello all, 
 
In H.248.1 it is said  that
"A new Signals Descriptor replaces any existing Signals Descriptor. Any signals applied to the termination not in the replacement
descriptor shall be stopped, and new signals are applied, except as follows. Signals present in the replacement descriptor and
containing the KeepActive flag shall be continued if they are currently playing and have not already completed. If a replacement
Signals Descriptor contains a signal that is not currently playing and contains the KeepActive flag, that signal shall be ignored."
 
In my understanding to this statement , if a signal with keepactive flag is not been played currently, it should be ignored. On the
other hand  if it is been played now ,the play should not be interrupted ,which means the new same signal is also not applied now. 
 
My question is  "Should the new signal be played after the old one is finished ?"   If the answer is NO, then the signal with
keepactive flag will not make any sense because  it is always useless. 
 
 
Thank you very much !
 
 
 

Best regards,

 

Chen Hao

 

NSN R&D BBA

Tel: +86 10 58421052

Email: chen.hc <mailto:[email protected]> @siemens.com

 

 

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