Typically this is done by the recruitement agency or the HR department to filter out and select candidates for a subsequent interview with the hiring manager.
Today, in globally dispersed teams phone interviews are also done by hiring managers to select candidates for a final round of in-person interviews.
Standup when speaking – this trick fills your voice with instant energy.
Smile when speaking – this trick fills your voice with enthusiasm and smile.
Make sure you get the interviewers name (correct spelling), eMail and phone number – and also office address if your next step is in person interview.
If necesary you can ask the interviewer to reschedule if you are at a noisy, inconvenient place – ask him to hold for a moment while you close the door.
Try to shoot for an in-person interview as a next step.
Send a thank you note after the interview as in the case of in-person interview.