Potentia Capital-backed Soprano Design has told shareholders in communications technology company Whispir they will get cash before Christmas if they accept its revised offer of 48¢ a share by Friday.

Whispir’s board rejected that price as too low when it was first offered in November, but Soprano on Tuesday declared its bid was unconditional and shareholders would be paid rapidly if accepted, putting the pressure on rival suitor Pendula to reveal its own offer.