Hi,
It is supported, see the following release notes here:
http://www.cisco.com/c/en/us/td/docs/telepresence/infrastructure/tms/release_note/cmr_hybrid_RNs_14_4.html#pgfId-164481
Expressway-E/C use is also covered in the deployment guide:
http://www.cisco.com/c/dam/en/us/td/docs/telepresence/infrastructure/tms/config_guide/cmr_hybrid_config_guide_tms_14_4.pdf
-Jonathan
Edit - links