The Volscian alphabet (see the picture) is of Latin origin, with a backwards C for Ç, a sibilant which was also used in Umbrian. As for the other central Italian dialects, such as Marsian, Aequian, Hernican and Sabine, they also seem to belong to the Volsco-Umbrian subgroup, though, close as they were geographically to Rome, were subject to Latin influence very early on.
The grammar of Volscian holds many of the common Osco-Umbrian features. It uses p instead of Indo-European kw, it often loses some final consonants in endings, and the -ns participle ending is changing to -f here, as in Umbrian.
Volscian had also a dialect called Auruncan, quute similar to it. Both of them were assimilated by Roman Latin language very soon after Rome conquered these lands.