FR EEK command missing
I'm currently running image: c1841-adventerprisek9-mz.124-24.T7.bin on my R4, R5 and R6. INE's instruction guide to be CCIE RS Lab states that c1841-adventerprisek9-mz.124-24.T1.bin image needs to be used for R4, R5, and R6. I cannot find this version (T1) on my CCO account but I can see all the others ranging from T2 - T7.
When attempting Volume 1 - Chapter 2.11 - Frame-Relay End-to-End Keepalives concept, I run into the issue where the parameter on the 'frame-relay interface-dlci ### class' command doesn't exist in my code. I checked Cisco's support for the 12.4T code and in the master list of commands, end-to-end keepalives per-VC doesn't exist. I used this page to verify: http://www.cisco.com/en/US/docs/ios/mcl/124tmcl/124t_04.html.
Can anyone provide me any insight? I'm assuming since this is practiced in Volume 1, I'll probably see it in Volume 2/3/4.