In reality jitter is due to traffic competing for the same link. Any variation in time spent in queue will cause jitter. On satellite links, unless you have SCPC (very expensive), you will always be sharing the link with someone else.
CIR only guarantees a delivery rate over time, not a delivery time.
Based on your diagram and what you say above, it seems to me that the voice calls are double hopping (over the sat twice)? If this is correct than your delay is doubled and you will certainly have issues.
With only one sat hop you should be able to get pretty good voice (we are doing it on our network) with voice delay being the only real noticeable issue.
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