atcomsystems.ca/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?

I have a newbie question.

FXO port VOIP box like Sipura functions just like a analog device looking for a dialtone(such as a Central office or PBX system)

If you have 2 PBX system(maybe even different brands) that you want to link together. Both PBX system have analog adaptor cards(which give analog devices access to the PBX including system dialtone)

If you plug an FXO sipura box into the analog adaptor port on both PBX systems, then both PBX systems will be linked? There will be a bridge between both PBX system's analog adaptor card ports right?

So when you are in location# 1 and you dial the extension number corresponding to the FXO port, it will let you call the PBX system in locatoin#2(and vise versa) ?

Essentially linking the analog adaptor cards on 2 different PBX systems? So both system can dial into the other system's?

Please let me know if that is correct?

Thanks.

FXS->FXO and vice versa

1. Ok so, FXO can't call out or and can't transfer you from FXO-to-FXO if you dial the extension it attaches to?


2. FXS can call both FXS and FXO ports?


Option#1 When it calls an FXS-to-FXS port, its basically calling a trunk line on another device. This is like a vonage-to-vonage customer call? Basically linking trunk 701(location 1)–to-trunk 701(location 2)?


Option#2, FXS-to-FXO call. This is like a Trunk-to-PBX(via analog port) call? SO accessing the FXS(trunk) in location#1, will send you to a dialtone created by the analog card in location#2?

Basically linking trunk(701) in location #1 to a an PBX analog adaptor port(essentially acting as a analog extension just went off-hook located on the PBX)

So accessing Trunk 701 in location #1, will give you system dial tone from location #2’s PBX system?



Please let me know if is true. That is my revised understanding now. I guess its complicated because I'm trying to link 2 offices with PBX systems.

Thanks.

You can do it that way and yes it works like coral said. it is the quick and simple way to link the systems.

We use to do it with a customer that had multiple locations. Node one would pick up the port on the trunk side, dail a 2 digit number which denoted the system they wanted to talk to. Then they would dail the extension needed.

Multitech makes some VoIP boxes that can use for FXS or FXO. You could tie analog extensions from both locations into this box, and then set up the routing in them. Works well.

Is the multitech the same as the sipura spa-3000 with FXO and FXS ports?

I understand the FXS-to-FXS concept because this is how vonage works. They are trunks can go into your trunk card on your PBX.

The part that I'm totally confused on is the FXO concept. I don't understand how the FXO is used when you are linking 2 PBX system.

If someone can explain how the FXO VOIP works and how it is connected into a PBX system. Maybe even give a scenario on how it might be used between 2 offices PBX systems. It would help me a lot.

Thanks.


P.S. Does anyone have any whitepapers which show a diagram of how to integrate the FXO port to link 2 PBX systems?

FXS=Station dialtome (single line)
FXO=Office Line (co port)

Basically FXS provides dialtone to the FXO. When you go off hook on the FXO you draw dialtone from the FXS. Clear as mud? It's exactly like the VOIP version of an OPX. Don't get confused.

If you use FXS on both system to extend an SLT port you have to goto a CO port OR FXO box (if ip)

Remember station dialtone to trunk port and vice versa be it IP or whatnot. The ONLY issue with it that could be a real pain in the a$$ is disconnect supervision.

FXO- foreign exchange office
An FXO card is accepting voltage on the analog side.

FXS- foreign exchange subscriber
An FXS card is generating voltage on the analog side.

Basically you are making a virtual point-to-point circuit when using FXO-FXS. The FXO side is always the office side whether it is a Central office or a PBX. The FXS side is always the subscriber side whether it is single line phone or line port on a key-system or PBX. Think of it like a logical cable as apposed to a physical cable. One end is the plug the other is the connector.

On VOIP or TDM equipment the analog sides are the same. Only the digital side changes the coding. The CODEC will convert the analog to digital and then the rest of the OSI model will change the signal to VOIP or TDM.........

What you are trying to create is an OPX circuit (off premise extension). So, instead of running a wire from LA to Pittsburg for ext. 107, you install an FXO in LA an FXS in Pittsburg using the Internet to connect them. When the guy in Pittsburg picks up his phone it’s like he’s in LA and on ext. 107.

You can’t mix FXS and FXS or FXO and FXO. That’s like being gay and pushing the design limit. You can however mix FXO an FXS. This is normal and within the design.

What they said, with the exception that you can mis FXS & FXS or FXO & FXO with the Multitech units (actually SST is correct, I just don't know how to word it to make sense without using FXO & FXS.) That's what makes them great. Of course they cost a whole lot more than the Sipura's. But, as Coral Tech said you will have trouble with disconnect suppervision which is a major problem.

Go to https://www.multitech.com/PRODUCTS/Families/MultiVOIP/

If you want more discussion about using the Sipura's as a point-to-point solution, https://voxilla.com/index.php?name=...amp;highlight=spa3000+spa3000+connection

In your example, there is a guy in Pittsburg which 1 phone connected into a SPIRUA FXS port. As soon as he picks up the phone, back in LA there is a FXO which has access to a phone line.

If the FXO in LA is connected directly into POTS, then the guy in Pittsburg will hear a dial tone for local telephone service in LA. Correct?

Take the exact same situation as you have given were the FXO is connected to a PBX analog phone adaptor for ex 107.

When someone in the LA office dials “107” in their office, they will ring extension 107 right? Only it will actually be ringing a phone in Pittsburg instead of an extension in the office. So you have created an Office premises extension.

Vise Versa, when the guy in Pittsburg picks up his phone, he will hear dial tone for the PBX system in LA. If he dials “ 0”, he will get the operator in the LA office if he dials “ EX 125” he will get his friend who extension is 125 right?

So equipment wise, you need a FXO for your main office and at least an FXS for your remote office. So, you need at least a SPA-3000 for your office because of the FXO port.
Is that correct?


When 2 vonage customers call each other, is that an FXS-to-FXS call? Is vonage one of the exceptions like multitech to this rule?