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=dmap1{(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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