If you use want to keep your traditional PABX, option 1 and 2 are available for you.
If you use IP-PBX, option 3 is your case.
For those who connect IP phones directly to Hoiio SIP, please refer to the case 4.
1. PABX with Gateway
Even if you use traditional analog PABX (PBX), you can still use Hoiio SIP. Gateway will convert analog signal into digital so it can go through IP network.
2. Hybrid PABX (SIP Card)
Alternatively, you can utilize a SIP card to make your PABX hybrid. The PABX will then work as both analog and digital.
If you are using IP-PBX, you can just configure Hoiio SIP with your IP-PBX.
4. IP Phones
You can also configure
each IP phone with one Hoiio SIP line, in which case you will not need PABX or
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