RSVP - Allowed reservable bandwidth

I don't see RSVP on the R&S blueprint but there is "signaling" so maybe I will see it. Anyways I had the following task today in IPexpert's volume 1 section 18:

- Link between R2-R5 is a T1
- Allow dynamic reservations done by applications using this link
- Allow oversubscription by 200% of the link speed.
- If RTP, make sure header is only 1-2 bytes

The last part is easy, it's juts RTP header compression. However the first 3 parts caused some trouble. Here's why:

R2(config)#int s0/2/0
R2(config-if)#ip rsvp bandwidth 3088

RSVP bandwidth (which is the bandwidth for the IP
headers and data inside them, but not the required
link layer headers) exceeds 75% of interface bandwidth.
It may be that you need to enter the 'bandwidth'
command to correct the system's understanding of the
available bandwidth. If that's not the case, then:
Due to bit-stuffing, layer 2 headers and layer 1
framing, and the need for routing and keep-alive
traffic, not to mention the RSVP messages themselves,
this is just plain too high. Configure your interface
realistically for the bandwidth available.

Easy right? Just set the max-reserved-bandwidth to 100% and set the bandwidth to 3088.

R2(config)#int s0/2/0
R2(config-if)#band 3088
R2(config-if)#max-reserved-bandwidth 100
R2(config-if)#ip rsvp bandwidth 3088

RSVP bandwidth (which is the bandwidth for the IP
headers and data inside them, but not the required
link layer headers) exceeds 75% of interface bandwidth.
It may be that you need to enter the 'bandwidth'
command to correct the system's understanding of the
available bandwidth. If that's not the case, then:
Due to bit-stuffing, layer 2 headers and layer 1
framing, and the need for routing and keep-alive
traffic, not to mention the RSVP messages themselves,
this is just plain too high. Configure your interface
realistically for the bandwidth available.

Not so fast! It turns out max-reserved-bandwidth doesn't apply to RSVP. So we have to set the bandwidth a little higher...how much higher?

3088/0.75 = 4118

R2(config-if)#band 4118
R2(config-if)#ip rsvp bandwidth 3088