NEXTEL Communications

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How it works

To use NEXTEL's IP PBX, make sure you have:
1. High-speed broadband service in your office if you are making VoIP outbound and incoming calls or have a branch remote offices.
2. Telephone lines from your local phone company to receive incoming calls and making outbound calls or an account from a VoIP service Provider.
3. You must have a ADSL Router with DHCP/NAT capability for your IP Phone to function properly.
4. You may purchase our IP Phones or bring your own but please check first with our technical support agents for compatibility before buying.

What do the terms FXS and FXO mean?
- FXS and FXO are the name of ports used by Analog phone lines (also known as POTS - Plain Old Telephone Service).
- FXS - Foreign eXchange Subscriber interface is the port that actually delivers the analog line to the subscriber. In other words it is the ‘plug on the wall’ that delivers a dialtone, battery current and ring voltage.
- FXO - Foreign eXchange Office interface is the port that receives the analog line. It is the plug on the phone or fax machine, or the plug(s) on your analog phone system. It delivers an on-hook/off-hook indication (loop closure). Since the FXO port is attached to a device, such as a fax or phone, the device is often called the ‘FXO device’.

FXS/ FXO procedures – how it technically works
If you are interested to know in more technical detail how an FXS/ FXO port interoperate, here is the exact sequence:

When you wish to place a call:
1. You pick up the phone (the FXO device). The FXS port detects that you have gone off hook.
2. You dial the phone number, which is passed as Dual-Tone Multi-Frequency (DTMF) digits to the FXS port.

Inbound call:
1. The FXS port receives a call, and then sends a ring voltage to the attached FXO device.
2. The phone rings
3. As soon as you pick up the phone you can answer the call.