I'd like to speak with Dr Martini.
Stress 'par-LA-re'. 'Dottor' (without final 'e') is used before a name.
Use this when calling a doctor's office, company, or institution and needing to be connected to a specific person. Always state the title and surname.
'Vorrei parlare con' = I would like to speak with. 'Il dottor' = Dr (masculine, used before name). Titles: 'il professor/la professoressa', 'il direttore/la direttrice', 'l'avvocato'. In formal Italian calls, title + surname is the standard form of address.
Posso parlare con la signora Ferrari?
Can I speak with Mrs Ferrari?
Less formal than 'vorrei'.
Mi può passare il responsabile?
Can you put me through to the manager?
When you don't know the name.
Cerco il reparto commerciale.
I'm looking for the sales department.
Asking for a department.
In Italy, using titles ('dottore', 'professore', 'ingegnere') is standard professional courtesy, both in person and on the phone. Anyone with a university degree ('laurea') can technically be called 'dottore'. Dropping the title without permission ('darsi del tu') is considered informal at best, rude at worst.