Connect local PSTN lines
Use FXO access when the carrier or existing site presents analog telephone lines.
Add the lines your PBX needs.
Bring analog, E1/T1 or cellular trunks into a SIP or IP-PBX system through an OpenVox gateway matched to the local carrier and capacity requirement.
The connection gap
The PBX may work well but still lack the line interface a site needs.
A new carrier, branch, backup path or capacity requirement can introduce analog, digital or cellular lines that the existing PBX cannot connect directly.
OpenVox gateways translate the required line type into SIP, allowing the PBX to add external calling without changing its role in the wider voice design.
Add higher-capacity trunks
Use digital gateway capacity for documented E1/T1/J1 and signaling requirements.
Use a mobile voice path
Add cellular channels as a primary, supplemental or backup trunk according to the deployment.
Combine line roles
Assign each trunk group to a specific route, site or continuity requirement.
Unified SIP access
Convert the local line type into a role the PBX can use.
FXO connects analog PSTN lines, digital gateways connect E1/T1/J1 services, and cellular gateways present mobile voice channels to SIP or PBX systems.
Analog PSTN
FXO access for local analog lines
E1/T1/J1
Digital gateway and signaling options
Cellular voice
GSM/WCDMA/LTE trunk channels
SIP / IP-PBX
The existing calling system receives the selected trunk role
Use the gateway family that matches the carrier connection.
Analog, digital and cellular gateways solve different line-access problems and should not be treated as interchangeable.
DGW-L20X
Linux-based E1/T1/PRI VoIP gateway with 1, 2, or 4 selectable spans, up to 120 concurrent calls, and flexible SIP routing.
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iAG800
Flexible 2/4/8-port FXS/FXO gateway for connecting analog endpoints and PSTN lines to SIP networks.
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SWG-3032 G/L Series Wireless Gateway
32-channel GSM/LTE wireless gateway for dense mobile voice, SMS, and SIP trunking deployments.
View productVerified gateway roles for external lines.
Based on OpenVox analog, digital, cellular and SIP documentation.
Analog PSTN access
OpenVox FXO products connect analog lines to SIP and IP-PBX environments.
Proof chips
- FXO
E1/T1/J1 options
Documented models support selectable digital trunk and signaling roles.
Proof chips
- DIGITAL
Mobile voice channels
OpenVox cellular products provide GSM/WCDMA/LTE voice access.
Proof chips
- CELLULAR
Purpose defined during design
Capacity, call direction and primary or backup routing are confirmed before selection.
Proof chips
- ROUTING
Match the next line to your PBX plan.
Share the carrier interface, channel requirement, phone numbers, current PBX and intended primary or backup role. OpenVox can help identify the appropriate gateway family.