HMP with Call Script app (VoiceGuide): "488 hot acceptable here" error for incoming calls

Hello,
We are using HMP with IVR app called VoiceGuide for our IVR solution.
After upgrading the software VoiceGuide, we get "488 not acceptable here" error upon "re-INVITE."
The call script used for this event does not have any call-transfer activities, which (I found out from this forum) is the usual cause of this error.

The VoiceGuide support team is not sure why this is happening with the new patch and suggested to ask Dialogic, so here I am.

I am attaching RTF log and wireshark log file just in case.
Any advice or help is appreciated.

Thanks.