V is pronounced
uve, then would it sound the same as
u-be)? If that is the case, how do speakers disambiguate this possible confusion?
A pause denotes a separate letter:
VIH: ube, i , hache
UBA: u, be a
People often use whole words to denote letters when there is noise, or when talking over the phone:
Valencia, Italia, Huelva
Uruguay, Barcelona, Almería
You can also say ve-baja for v and be-alta for b.