There are two things I don't see often: first, unlike initial invite with G711 and RFC 2833 digits, the re-invite comes with G711 only. If the app does not change the DTMF xfer mode to inband before responding the second invite, HMP would reject such request due to incapable capacities. Second, the switch adds silenceSupp off attribute, which is meaningless for HMP G711, since it is always off for this codec, but it should be OK, I guess, HMP would just ignore it. RTF logger is set for errors only, so I can't tell what was the reason for rejection. Please enable Global Call, Global Call for IP, gc_h3r and SIP stack and retest. It should show you the exact reason for 488 Not Acceptable Here response.
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