  In recent years new functionality for VLBI data processing has been added to
the CASA package. This paper presents the new CASA tasks 'fringefit' and
'accor', which are closely matched to their AIPS counterparts FRING and ACCOR.
Several CASA tasks received upgrades to handle VLBI specific metadata. With the
current CASA release VLBI data processing is possible, and functionality will
be expanded in the upcoming release. Longer term developments include fringe
fitting of broad, non-continuous frequency bands and dispersive delays, which
will ensure that the number of use cases for VLBI calibration will increase in
future CASA releases.
