I assume you are talking about the connection between CAD and the contact center servers, correct? IOW, your CAD is intermittently disconnecting. The CAD communication with the CCX server is not really that bandwidth intensive but I don't have specific numbers to give you Cisco best practice on latency, bandwidth, etc. for JUST the CAD communication. Cisco design guides focus more on the audio channel and concerns around ensure voice calls can complete successfully.
That being said, having adequate bandwidth in and of itself is not enough. You will want to ensure you have end-to-end QoS from the remote site, through the MPLS network, and to the central site. Further, the CAD communication to the UCCX system (TCP 42027) should be set to CS3 (DSCP).
You could also check end-to-end latency to see if your network is performing the way you expect/hope. Long and short, bandwidth by itself is not enough. Make sure you don't have link saturation, check qos, etc.
HTH.
Regards,
Bill
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