The GSM PBX unit is a GSM cell phone on one side, and a connector to a landline (PSTN) on the other side. Similar devices (switching gateways) have been in common use by long distance service resellers to cut cost of operation for years. Businesses also use similar devices that support 50 or more simultaneous conversations. Our unit is a home or small business version with one line mobile GSM and one landline. Examples of practical applications include:
· Call cell to cell (free inside the same plan) to talk free to other mobile phones regardless of carrier, keeping a minimum of "pre-purchased" minutes on the plan. You call the mobile end of the PBX and the device dials your party on the landline side where you have a good rate or a flat fee VoIP connection.
· Call cell to cell (free inside the same plan) to dial International Long Distance calls from your mobile device using the discount rates on your home phone subscription.
· In ROAMING mode, call-forwarding and SMS call-back while you are away overseas allow you to still use your home discount long distance rates from/to anywhere.
Here is just one example**:
“Say Steve is an AT&T Wireless™* client with two GSM cell phones, for himself and his wife. Steve installs the GSM PBX device at home. He calls AT&T™ and requests a third number (and SIM card) to be added to his plan. This costs him an additional $10/month. He removes the SIM card from the free phone received and inserts SIM card into GSM PBX, making the device fully functional. Now he can talk to GSM PBX for free as much as he wants anytime (subscriber to subscriber call within the same calling plan). GSM PBX now dials all his calls via the low-cost home landline, so Steve experiences a sharp decrease in the number of paid AT&T™ minutes used. He can now switch to a plan with less minutes to save even more."
*All trademarks and trade names used in this manual are the property of their respective owners.
**Adding a cheap direct-dial international long distance plan to your landline (or VoIP) allows even greater flexibility.