sundance-communications.com/forum Forums VOIP Phones & IP PBX VoIP & Cloud Phones, Hosted PBX, General IP Phones FXO-to-FXO = pbx-to-pbx internal bridge for system dialtone?

Not really. Vonage is using the ATA to deliver dialtone via the FXS port. You could say it is an FXS to FXS call. But you would also have to say that every traditional call made via the local telco is an FXS to FXS.

Am I just making you more confused?

I'm not familiar with Multitech. Maybe they sense voltage and the port changes gender like someone from Hollywood. But the original design was FXO= dial tone in and FXS= dial tone out.

On the Vonage issue, both customer ends would be FXS. But both circuits terminate in a Vonage switching office. I've never been in a Vonage CO and can only make an educated guess on their network topology.

If you add a second OPX circuit to the above example, say ext. 108, in Seattle. Both locations would be FXS in Seattle and Pittsburg. So, the guy in Pittsburg picks up his extension (107) and dials 108. Doing this, he calls the guy in Seattle. They are both FXS on their ends but they are actually being switched trough the LA PBX. Remember, PBX is a private branch exchange as apposed to a public Telco’s much larger branch exchange. How you are physically connected only depends on the technology you are using. Local Telco's use copper wire with repeaters, CLEC's use T1's, Cell phone companies use radio waves and Vonage uses Voip over the Internet. Typically.

Maybe Vonage is not FXS-to-FXS after all but maybe on Vonage switching office, it goes to the FXO before it goes to the other customer's FXS device.


1. Is the PBX doing the switching or the VOIP FXO/FXS Networking device SPA-3000 is doing the switching 2 remote extensions?


2. The LA office PBX system is linked to the VOIP network from the FXO port? Since the FXO is dial tone in, you must provide dial tone with your PBX system right?


3. Does your LA office need 2 FXO ports to support 2 OPX? One FXO port for extension 107 in Pittsburg and another FXO port for extension 108 in Seattle?


4. So the entire concept is that in your Main LA office, you replace an analog phone plugged into your PBX with another FXO device called a SPA-3000.

The FXO port on the SPA-3000 will teleport (via internet) all calls both in and out from that extension to another FXS device on the internet.

Thanks.

We use Multi tech with FXS on both ends. That way it works the same for all users. The limitation is that the xfered calls to remote station comes in on the intercom, but it keeps it simple. The ports can work both ways, which keeps cost down.

And when using MultiTechs propritary Net Coder, it works fine without a VPN.

I would consider the Vonage switch to be on the FXO side and the customer to be on the FXS side.

1. PBX is a switch, so does the switching. The SPA-3000 is an adapter, so only converts digital packets to analog and vice versa.

2. Correct. My example is that the pbx port is an analog port, not a digital port.

3. Yes. Both ports are independent circuits.

4. Yes. The FXO interface connects to the FXS over the internet as an onramp connects to an off ramp over a freeway.

Hey, I am looking for a pbx system provider near Chicago. Do you guys have any idea about it and how much money I have to spend for 20 connections which are going to install in my office. I have been thinking about getting pbx system since a long time but now it’s time to get those connections stable at my office because my office employees are giving problems me on this matter.

https://www.voipphonesystemquote.com/

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