| Works without phone line | Yes | Yes | No |
| PBX-to-phone line calls | Yes, (around 1.0 Eurocent/min to North America/Western Europe), no monthly fee, provider can be chosen freely | Yes, (around 2.0 Eurocent/min to North America/Western Europe), monopoly (provider cannot be chosen) | Yes (prices depend on PSTN providers, usually include monthly fee, more expensive nation-wide and much more expensive international. Providers can be selected with restrictions (only those providing the service in the area) |
| Phone-to-PBX | Yes, free numbers in USA, UK, Netherlands for every user. Local/800 numbers in almost any country starting at $2/month | Yes, around $10/month per user, numbers limited to 8 countries (Denmark, Finland, France, Hong Kong, Poland, Sweden, UK and US only) | Yes, one local number only. Included in the monthly fee |
| Cross-platform/cross-device | Yes, Uportal Phone clients can be any standard SIP/IAX devices (either software or hardphones). Software clients available for free for all popular platforms (Windows, Linux, Mac, Windows Mobile, iOS, Android, etc) | Partially. Software only. Available for Windows, Linux, Pocket PC, Mac) | No (Hardphones only) |
| Web client available | Yes | No | No |
| Location-independent | Yes | Yes | No |
| Free calls between users/branches | Yes | Yes | Partially (on single site only) |
| Instant Messaging | Yes | Yes | No |
| Personal voice mail | Yes, free | Yes, around $2 month per user | Depending on configuration |
| Audio conferencing between users | Yes, easy and free | Yes, easy and free | Depending on configuration, difficult to setup. |
| Video conferencing | Yes (video-support on the client side required) | Yes | No |
| Works in corporate (firewalled) networks | Yes | Yes, but could pose danger
| - |
| Click-to-call | Yes | Yes | No |
| “Copy-n-paste calling” (paste phone numbers from website, your address book, etc) | Yes | Yes | No |
| Call forwarding | Yes | No | Yes |
| Online real-time call statistics and billing by call type (business calls, private calls, Internet calls), by user (accessible for administrators only) as well as general statistical information (number of calls, total duration, etc) | Yes, easy to view and process | Yes, per-user-only | No |
| Pre-payment | Yes | Yes | No |
| Post-payment | Yes | No | Yes |
| One corporate phone bill (no separate bill for every employee) | Yes | No | Yes |
| Online corporate phone directory with “click-to-call” capability | Yes | No | No |
| Instant online credit loading for private calls | Yes (Paypal, Credit Card *) | Yes | No |
| Paying through bank wire transfer | Yes | No | Yes |
| “No Server” version available | Yes | Yes | No |
| Local installation available | Yes | No | Yes |
| Server price | Starting at $900 US | - | Depending on setup, going into tens of thousands of dollars |
| Works without special hardware | Yes | Yes | No, hardware quite expensive |
| Works without separate phone cabling | Yes | Yes | No |
| Works without hardphones | Yes | Yes | No |
