Calling where fixed lines are unavailable
Use a cellular trunk as the main external voice path for a qualified site.
Use cellular trunks for business calling.
Bring cellular voice channels into the PBX for primary, supplemental or backup business calling. Keep mobile-network access within the SIP call plan and route calls through the existing PBX.
When fixed lines do not fit
Bring business calling to sites without fixed trunks.
Temporary locations, remote sites and fast branch openings may face unavailable fixed lines, long provisioning cycles or a need for another route.
An OpenVox cellular gateway presents mobile voice channels to the PBX, allowing the project to define them as a primary, supplemental or backup calling path.
Add route-specific capacity
Assign cellular channels to a particular call type, location or operating requirement.
Provide another carrier path
Route selected calls through cellular voice when the primary trunk cannot serve them.
Support a new or temporary location
Establish calling while the longer-term site and carrier design is still being completed.
Cellular-to-SIP path
Present mobile voice channels as a trunk the PBX can route.
The gateway connects to the cellular network on one side and the SIP or PBX environment on the other, with capacity and routing determined by the project.
Cellular network
GSM, WCDMA or LTE voice service
GWP2120 gateway
Modular cellular channels and SIP trunk presentation
PBX / UCP
Routing, extensions and business calling
Business users
Office, branch or temporary-site phones
Use GWP2120 for modular capacity, with SWG only as a defined alternative.
GWP2120 is the primary 4-to-44-channel path in this solution; SWG-3016 remains a fixed 16-channel option when that capacity model fits the site.
Verified capability for each trunk role.
Operator approval, connection rate and cost outcomes remain outside the stated solution scope.
GSM/WCDMA/LTE channels
OpenVox cellular gateway and UCP module documentation covers mobile voice access.
Proof chips
- VOICE
Primary or backup use
Documented deployments use wireless voice as a main or alternate trunk path.
Proof chips
- TRUNK ROLE
PBX interworking
Cellular channels connect to the calling environment through a defined SIP or platform role.
Proof chips
- SIP
Operator requirements confirmed
SIM, numbering, routing and local operator rules remain part of project assessment.
Proof chips
- POLICY
Plan a defined cellular calling path.
Share the location, operator, expected simultaneous calls, PBX, number requirements and primary or backup role. OpenVox can help map gateway capacity and SIP routing.