Most Realtors try to impress prospective Seller's with their websites, popularity, local knowledge, ad campaigns etc. Most never mention and Seller's never hear about the Showing Service. A chain is only as strong as it's weakest link, and a poor Showing Service approach can be disastrous.
For the most part, there are 3 methods a Realtor or Broker will use to set up a Showing Appointment.
The 1st is calling the Listing Agent Direct. This is the least productive method. If the Agent is In Church, On a Plane, In a Mall, or their Voicemail is delayed, the home will probably miss the appointment.
The 2nd is the Subcontracted Showing Service. This method is effective to a point. The hourly wage call taker's generally do not know anything about the house and may not care to. Often, the instructions aren't accurate, and anything requiring a personal touch (e.g. the dog will be in the garage) can be regretfully omitted.
The 3rd method is a call directly to the Listing Office. The instructions and care given by another Realtor, who answers the call, is usually Professional and Comprehensive. A progressive Office will transfer the Calls on Nights and Weekends to an On Duty Realtor's cell phone. A Seller's prospective Showing will be handled with the Seller's and Listing Realtor's best interests at heart. Appointments won't be missed and detailed instructions will be relayed.
Thinking of selling? Get the Showing Instructions of the Realtor's Company and give it a try on weekends or off hours, before making a decision. Keep in mind, that most of the Showings will be on weekends or after work when the buyer's are free to see homes.