.. the phone !?

Startled, Vanessa remains motionless in the hallway in front of her room.
Somewhere inside the house a phone is ringing.
It's not hers tough, she would recognize the ringtone.

She tries to detect the origin of the sound, hesitatly looking inside every bedroom, and then hurries downstairs.

Could it be the old wall phone in the kitchen downstairs?
But who would use that number?
All the people who know she's here would probably just call her on her cell phone ...
Vanessa reaches the kitchen as fast as she can, losing even one of her flip flops in the rush but ...