Here are the short answer:
1. Yes, G729 can be used on network side for streaming of RTP for IP calls in this case
2. Yes, G729 comes as part of Enhanced RTP port option in HMP licensing.
3. Not sure, would need to see the full content of you license to answer that question.
4. Yes, if that is the case, then only G711 can be used for RTP streaming of audio over the network.
Overall, it sound like you might need to get trial license from Dialogic Sales for any new opportunity you may be working. I would suggest contacting you sale fae/rep for additional questions.
Regards,
Jeff