As your team interacts with customers every day, the methods they use need to run smoothly. The tools they use to communicate cannot be the reason poor service occurs. Even if your office has a PBX, you can equip it with a reliable cloud phone system, too.
1. Thank Them or Apologize. The basic rule of thumb is that callers should hear one of two things when they first connect with your voicemail — either an apology for not being able to answer the call or a “thank you” for having called.

That’s why it’s important to clearly identify yourself and your company right out of the gate. And while it may be tempting to tack on your phone number, it’s best to leave it out. Restating your number takes up valuable time, and the idea here is to provide all the information your customers need—and nothing they don’t. Keep voicemail greeting up to date. Many voicemail greetings take the generic approach of stating the person reached, the company name, and a statement about being away from the desk or unable to answer. The problem here is the fact that your callers already know this.
All that makes configuring and managing home routers very difficult for IT personnel, but they'll still be faced with that task because if employees run into conversation problems over their softphones, their first call will be to the IT help desk. Shunting them off to the VoIP provider, or worse, the ISP isn't a good idea either. It'll likely cause employee frustration since those outfits won't be familiar with your company and they'll either refuse support or it'll take a very long time.