SIP disposition after 488 to T.38

Hi List,

Here's a setup and packet capture flow:

SIP box				Cisco
[ab.com]			[xy.com]
INVITE	xy.com	--------->	
		<---------	100 TRYING
		<---------	183 Session Progress
		<---------	200 OK
ACK	xy.com	--------->
		<---------	re-INVITE ab.com to t.38
488		--------->
		<---------	ACK
...
...

Given that only available codec of g.729 at Asterisk side,
what messages
are to be expected after the T.38 re-invite has been made
and was
rejected with 488?

Thanks,

Roy

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