Is the silence of women a cultural custom or a Biblical mandate?

Som evangelicals act as though "women keeping silence" is outdated. What is the Biblical message of 1 Corinthians 14?

Some claim Paul (1 Cor. 14:34) legislated temporary cultural adjustments, not intended as mandates for the whole church period. The immediate context, however, recognizes these as the Lord's commandment. The directive is as clearly a commandment, and as strong, as any other in the epistle. To set it aside would give liberty to depart from other guidelines regarding, for example, remembering the Lord (chapter 11) and exercising gifts (chapter 14). Few evangelicals would be willing to do this. The only way that women's keeping silent in the church becomes outdated is by rejecting the whole epistle.

J. Beattie