Done it and it's working fine.
I cannot give you the Cisco side of it, but here's what it looks like from the 3300.
On the 3300 set up an E1/CEPT link descriptor with the following parameters:
Link Descriptor Assignment
Number: 1 (or whatever)
Address for Message Control: A
BER - Maintenance Limit, 10**-n: 4
BER - Service Limit, 10**-n: 3
Data Call Alternate Digit Inversion: No
Framing Losses in 24 hrs - Maintenance Limit: 255
Framing Losses in 24 hrs - Service Limit: 9000
Integrated Digital Access: ISDN NODE
Vendor Inter-working Type (Philips SOPHO): No
Satellite Link Delay: No
Slip Rate - Maintenance Limit (slips/24hr.): 5000
Slip Rate - Service Limit (slips/24hr.): 7000
Alarm Debounce Timer - Service Limit (millisec.): 500
Voice Encoding: Nil
Data Encoding: Nil
QSIG Private Network Access: Yes
Digital Link Fault Delay Timer (sec.): 240
Termination Mode: NT
Send Malicious Call Indication to PSTN for Tagged Calls: No
T1 Only:
B8ZS Zero Code Suppression: Yes
Operation Mode: DSX-1
CSU Tx Line Build-Out (dB.):
DSX-1 Line Length (Ft.): 0-133
Extended Super Frame: Yes
Inverted D channel ( DPNSS only ): No
E1 Only:
CRC-4 Enabled: Yes
E1 Line Length (Ft.): 0-133
E1 Impedance (Ohms): 120