RE: Megaco Event Descriptor question

After the second Modify, the GW would only report tones detected
according to the new Events descriptor in that command, and would no
longer process the digit map.  The quote at the end of your message is
applicable, exept that it is from H.248.1, not RFC 3435 which describes
MGCP.
 
Raphael Tryster (not a guru but standing in for vacationing gurus)

________________________________

From: Ramesh Babu Kuppili [mailto:[email protected]] 
Sent: Thursday, December 27, 2007 11:14 AM
To: [email protected]
Subject: [Megaco] Megaco Event Descriptor question


Hello Gurus,
 
I have a question about Megaco Event Descriptor.  I am receiving the
following message from the MGC.
 
!/1 [xx.xx.xx.xx]:2944
T=372855742{C=-{MF=A1{E=369098767{dd/ce{DM=dmap1},al/*},SG{cg/dt},DM=dma
p1{(1xx|9xx|0[2-9]xxx|00[1-9]xxxx|[2-8]xxxxxx|0[2-9]xxxxxxx|05xxxxxxxx|E
|F|x.F|[0-9].L)}}}
 
The event descriptor in the above message is asking the GW to use
ditigmap "dmap1".  After sometime we are receiving the following message
from MGC:
 
!/1 [xx.xx.xx.xx]:2944
T=372855743{C=-{MF=A1{E=369098752{tonedet/std{tl=*},al/*},SG{}}}
 
Please note that the event descriptor in the above message does not have
any digitmap event.  The quesion is, "on receiving the seocond modify
from MGC, should GW still be detecting DTMF to be reported immediately
to the switch based on the dtmp package received in the first modify
message.  
 
Or should it overwrite its event decriptor with the one from second
Modify (RFC 3435 seems to propose this).  Thereby not detecting any DTMF
after the second modify is received.
 
text from RFC 3435
"An EventsDescriptor received by a media gateway replaces any previous
Events descriptor. Event notification in process shall complete, and
events detected after the command containing the new EventsDescriptor
executes, shall be processed according to the new EventsDescriptor."
(section 7.1.9).
 
Thanks for your time.
 
- ramesh
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