Heat oil in soup pot over medium heat.
Add fennel, and sauté 3 to 5 minutes.
Stir in sausages and fennel seeds, and cook 5 to 7 minutes, or until fennel seeds are slightly softened and bits of sausage are stuck to bottom of pan.
Add vermouth, and cook 5 to 10 seconds to deglaze pan, scraping up any brown bits.
Add broth, tomatoes, and parsley; cover, and bring to a boil.
Reduce heat to medium-low, and simmer 10 minutes.
Season with salt and pepper, if desired.
