This object, if set to true(1) identifies that this endpoint as the `master' endpoint of the connection. When set to false(2) this identifies the `slave' endpoint of the connection. The slave endpoint is the called party, while the master endpoint is the calling party in the SPVC call setup. The networking entity initiates routing of a SPVC connection only after a master endpoint is added. Mastership of a SPVC cannot be changed, once provisioned, implying that this object can be set only during row creation.