Cisco AS5400 SIP + 56k Dialup

I would like to terminate inbound 56k dialup calls. Currently the Cisco AS5400 gateway for incoming SIP calls. I need a modification of the current config so that any call received from a specific DID 800-555-1212 will be answered by a 56k modem. The gateway must continue to reroute the other calls to the sip server The hardware used is: Cisco AS5400HPX (R7K) processor (revision T) with 262144K/65536K bytes of memory. Backplane HW Revision 1.0, Flash Type 3.3V 2 FastEthernet interfaces 198 Serial interfaces 216 terminal lines 8 Channelized T1/PRI ports 512K bytes of NVRAM. 32768K bytes of processor board System flash (Read/Write) 8192K bytes of processor board Boot flash (Read/Write)