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VoIP between 2 sites with analog PBX

Posted on 2006-10-24
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Last Modified: 2010-04-12
Hello all,
we have 2 sites, let's say Site 1 and Site 2.

Site1 is the main site with local PTT and we have a PBX that have analog lines internally. Only analog, no digital or IP possible.

Site2 is a remote site with a wireless backhaul (perfect link). We want to have Site2 using the same PBX.

What we were thinking is:
PTT--PBX--Analog line--Analog VoIP gateway on Site 1====Wireless IP Link====Analog VoIP gateway on Site 2--Analog line--Regular Analog Phone
Can it work and if yes, what type of harwarde should we use if not, any recommendation ?

thanks for any help
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Question by:lemaitre75
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Expert Comment

by:grblades
ID: 17810329
How many spare ports do you have of either type?
You have FXO ports which are the type designed to connect to the phone network.
You have FXS ports which are designed to connect to analogue phones.

You would need a FXO port for every simultaneous call you wish to make to the remote pbx. You would need a FXS port for every simultaneous call you wish to receive from the remote site.

Check to make sure you have enough spare ports available for your needs and then I can advise on what equipment to get.
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Author Comment

by:lemaitre75
ID: 17814226
We have enough ports but we just need 1 line (1 concurrent call) in that case

thanks
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Accepted Solution

by:
grblades earned 250 total points
ID: 17828407
If site2 is going to have just a single phone then it makes things easier.

At site1 get a Linksys SPA-3102 (http://www.voipsupply.com/product_info.php?products_id=1646) and link its FXO port to a FXS (standard analogue telephone port).

At site2 get a Linksys SPA-1001 (http://www.voipsupply.com/product_info.php?products_id=320) and connect an analogue phone to it.

Then you just need to configure both devices to connect to each other.
When the PBX rings the phone the SPA-3102 passes the call onto the device at site2 and when the phone is answered the call is connected.
When someone uses the phone at site 2 then the SPA-1001 will provide dial tone and listen for the dialed digits and when finished it will pass the call over to sitte1 and the SPA-3102 will pick up the analogue line to the PBX and dial the digits and then connect the call.

You can buy additional pairs of these devices to add more phones to site2 if you wish.
Its gets more complex if site2 has its own pbx and you want to link them both but it does not sound as if this is the case for you.
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