OK so VOIP communications have been gaining ground over conventional telecoms - here are some of the reasons why:

1. Low Cost Landline Calls - VOIP call carriers offer low call rates or free national calls.

2. Low Call Rates to Mobiles - without long tie-ins - especially when using GSM gateway equipment

3. Cheap International Calls - most providers offer very low or inclusive international calls.

4. Reduced Line Rentals - many VOIP call carriers offer unlimited outbound trunks which could cut your line rental fees.

5. Free Calls to Remote Offices & Workers - calls between VOIP enabled remote workers & offices would be free.

6. Longer Call Recording - Voip calls recordings are small in size & need less storage capacity than convetional calls.

7. Keep Geographic Number - by switching to voip your landline number can move with you.

8. Automatic Call Diversion - should your PBX or internet fail your calls will be diverted automatically

9. Shorter Contracts - most VOIP suppliers have short contracts.

10. Better Control - apply call diverts and change your phone system settings remotely.

If your VOIP solution is correctly set-up then you shouldn't be able to differentiate between conventional & VOIP calls - see voip call quality for more info. It's not always plain sailing as telecoms companies sometimes cause number porting delays & broadband services will vary with location - success or failure will in most cases will boil down to the experience or incompetence of your installer.