The NHL and NHLPA each met separately with a federal mediator throughout the day and into the evening Friday.
The two sides plan to continue the process Saturday.
For the second straight day, the league and union met separately. Mediation meetings started at 10 a.m. ET and ran until shortly before 11 p.m. on Friday, with federal mediator Scot L. Beckenbaugh going back-and-forth between the NHLPA's hotel and the league office.
However, there is no decision on when large-group negotiations will resume.
NHL commissioner Gary Bettman has said a regular-season schedule of at least 48 games must begin by Jan. 19. The existing 2012-13 NHL schedule has already been canceled through Jan. 14.
The two sides have been without a CBA since the previous one expired just before midnight on Sept. 15.