Cascading feature with TP Conductor and TP Server has 2 limitations:
A. Multi-screen endpoints are supported with more than 3 TP Server cascading
B. Scheduling conference is not supported
C. Ad-hoc conferencing are supported with more than 3 TP Server cascading
D. Ad-hoc conference is not supported
E. Only single screen endpoints supported through cascading links.
https://www.cisco.com/c/en/us/td/docs/telepresence/infrastructure/tms/config_guide/cmr_hybrid_15_0/cmrh_b_cmr-hybrid-configuration-guide/cmrh_b_cmr-hybrid-configuration-guide_appendix_010011.pdf
D and E