For the above subject i found a document on cisco website as shown below.
My question is does 801 support Leased-Line ISDN at 128 kbps ?
coz in the document below 801 is not mentioned
................................................document............................................................
Platforms
Leased-Line ISDN at 128 kbps
This feature is supported on these platforms:
Cisco 1003, Cisco 1004
Cisco 4000 series (Cisco 4000, 4000-M, 4500, 4500-M, 4700, 4700-M)
The Cisco 2500 series does not support this feature because its BRI hardware does not support channel aggregation
http://www.cisco.com/univercd/cc/td/doc/product/software/ios112/isdn128k.htm