Hi Chris,
How are you?.
You can upload a banner for Auto attendant in MSE 8510
1. Go to Conferences>Auto attendants
2. Click on the name of configured Auto attendant.
3. Click on the banner tab
4. Upload the banner file and select it.
5. Click update.
You can also remove or overlaid logo for certain duration
1. Go to Settings>Conferences
2. Select from drop down next to "Overlaid logo duration"
This cannot be done on TPS 8710.
Hope this helps. Let me know if you have any queries.
-Sagar