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WSNSD
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Extend PSTN across LAN for a fax machine

---Equipment
2x Linksys SPA3102 ("spaone" & "spatwo")

---Goal
To be able to fax in/out by "extending" the POTS line across the LAN like so: FaxLine>spaone>LAN>spatwo>Fax

I've searched online and found the following config which I've used...
***************************************************************
On the SPA3102 attached to the PSTN line.

PSTN Line Tab

Line Enable: YES

NAT Mapping Enable: yes or no depending on the router used
NAT Keep Alive Enable: yes or no depending on the router used

Register: No
Make Call Without Reg: Yes
Ans Call Without Reg: Yes

UserID: spaone

VoIP-To-PSTN Gateway Enable: yes
VoIP Caller Auth Method: none
VoIP Default DP: 2
VoIP Caller Default DP: none
none will give you the actual PSTN dial tone when the VoIP-to-PSTN gateway answers the call


PSTN-To-VoIP Gateway Enable: yes
PSTN Caller Auth Method: none
PSTN Ring Thru Line 1: no

PSTN Caller Default DP: 2

Dial Plan 2: (S0<:spatwo@ipaddress:5060>)
The dial plan will automatically dial the distant SPA3102 Line 1 when the PSTN-to-VoIP gateway answers the call

Where spatwo is the userid on the Line1 tab of the distant SPA3102 (spatwo)

Where ipaddress is the ip address of the distant SPA3102

Where 5060 is the sip port number of the Line 1 tab on the distant SPA3102

VoIP Answer Delay: 0
PSTN Answer Delay: 2

Where 2 seconds is long enough to receive an incoming caller id on the pstn line (if you care about it)


Line-In-Use Voltage: 30

Where 30 is about half way between the on-hook and off-hook voltage of your pstn line (polarity disregarded)

Line 1 Tab

Enable IP Dialing: YES

On the Distant SPA3102 Line 1 tab

Line Enable: Yes
NAT Mapping Enable: yes or no depending on your router
NAT Keep Alive Enable: yes or no depending on your router

Register: No
Make Call Without Reg: Yes
Ans Call Without Reg: Yes

UserID: spatwo

DialPlan: (S0<:spaone@ipaddress:5060>)

Where spaone is the useid on the pstn line tab of the SPA3102 attached to the pstn line

Where ipaddress is the ipaddress of the SPA3102 attached to the pstn line

Where 5060 is the sip port number on the pstn line tab on the SPA3102 attached to the pstn line

Enable IP Dialing: YES
***************************************************************

I've tried hooking both spa's on the LAN then tried both on WAN w/o success (and changing the IP under the LAN and WAN tabs respectively). I assumed the fax line would be in "line" of spaone, the LANport attached to the LAN (WANport unused). On spatwo, LANport attached to LAN, and the Fax machine attached to "phone".

On the phone port of spatwo I just get a busy signal (same tone I get when I have nothing plugged into lan or wan on spatwo). Afaict there's no communication between the two SPA units.

I'm assuming there's missing information in the config.
IP TelephonyNetworkingRouters

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WSNSD

8/22/2022 - Mon
Phonebuff

Don't think what you want will work this way --

I assumed the fax line would be in "line" of spaone, the LANport attached to the LAN (WANport unused).

The LAN port on these is a passthrough so that you can share a PC network drop or other device with the SAP unit.   If these are going to talk your network will need to be on the WAN side regardless of where you place them on the network topology.

Not sure about the rest of your configuration --
WSNSD

ASKER
Thanks, I thought that might be the case and I did try using open IPs on the existing network for the WAN interfaces on the SPA units. I left the SPA LAN ports unused and patched the WAN ports into switches on either end. No hops between the two units. Still no dial tone though.
Phonebuff

Sorry I don't understand --

     But you could try using a common network on both --

     192.168.200.21  on one and 192.168.200.31 on the other and a cross over cable or common switch to start with..
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rwheeler23
WSNSD

ASKER
Exactly, to clarify, I have

spaone wan set to 192.168.200.21
&
spatwo wan set to 192.168.200.31

with a switch between them, is how I have it setup currently.
Phonebuff

That should work -- As to the SPA setting to go FXO (one) to FXS (two) I am not sure as It's been a long time..
WSNSD

ASKER
I reset and used the config attached.

I seem to get dial tone(simulated?) on the remote SPA after a couple stutters "dit-dit-daaaa..." but I still can't make calls in/out.

I've them setup the following way

phone line > spaone "line" port
spaone "Internet" port (192.168.200.201) > switch
switch > spatwo "Internet" port (192.168.200.202)
spatwo "phone" > fax/phone

nothing else in switch but these two spa units
spa-backtoback-2x-spa3000.pdf
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WSNSD

ASKER
Got various configs from Linksys support forums, all which produced either same or no results. There's no consistency and apparently no clear solution. Doesn't help that I keep getting disconnected from support today due to their own phone issues (ironic).

Returning these and will find a better solution.
ASKER CERTIFIED SOLUTION
Phonebuff

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WSNSD

ASKER
Thanks I'll chk into those.
WSNSD

ASKER
Went with the AudioCodes MP114FXO and a MP112FXS (thanks Phonebuff)

5mins later following only the User Guide(section 25.15.5) we had it up and running.

Linksys returned.
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