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, digital and cellular external lines into the PBX through a controlled SIP connection. Match each line type to the required interface while keeping numbering and call routing under the existing PBX.
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 each local line type into a role the PBX can use.
Analog, E1/T1/J1 and cellular services enter through different gateway roles, then reach the PBX through a controlled SIP connection.
- 01Analog PSTN
FXO carrier access
- 02E1 / T1 / J1
Digital carrier access
- 03Cellular voice
GSM, WCDMA or LTE
- 04iAG800 V2 + DGW-L302 + SWG-3008
Gateway matched to each line type
- 05SIP / IP-PBX
Routing and business calling
Start from the carrier handoff
Record the physical line, signaling and capacity before selecting a gateway role.
Keep line types visibly separate
Analog, digital and cellular services remain distinct access paths.
Let the PBX own call policy
Present the approved access path to the PBX for numbering and routing decisions.
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.
Verified 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.