No, this set would appear to be proprietary.
This from the brochure...
Compatible Systems
This model supports the following
PBX version and CODEC types:
NCP Ver.1.0 or later
TDE Ver.1.0 or later
TDA50 Ver. 4.0 or later
TDA100/200/600 Ver. 5.0 or later
CODEC: G.729A, G.711, G.722