1. Registration with the existing telephone number
2. Free unlimited calls within the user’s speakSIP community -- all the IP PBXs that are connected to speakSIP
3. Additional free minutes for off-net international landline phone calls
4. If users increase their speakSIP community by adding new business partners, more free minutes remain for international calls outside the network
5. Users grow their speakSIP community by inviting their partners to register for free as speakSIP friends
or speakSIP members
6. The dialing method remains the same -- phone numbers and extension numbers remain the same
7. Compatible with all IP PBXs: Panasonic, Avaya, Cisco, Mitel, 3CX, FreePBX, Asterisk, etc.