following IOS releases are sufficent for SDM for 1700 router series.
" Cisco 1701 ADSL Security Access Router; Cisco 1710, 1711, and 1712 Security Access Routers; and Cisco 1721, 1751, 1751-V, 1760, and 1760-V Modular Access Routers:
" Cisco IOS Software Release 12.2(13)ZH, 12.2(13)T3, or 12.3(1)M