Retain devices that still serve a purpose
Keep analog phones and fax endpoints in service when project validation confirms they fit the new calling design.
Bring analog devices into your IP voice network.
Retain analog phones, fax machines and other established devices while introducing SIP and IP-PBX connectivity through OpenVox FXS gateways.
The migration decision
Useful analog devices should not set the pace of an IP-PBX project.
Analog phones, fax machines and other established devices may still perform a necessary task even when the voice core is moving to SIP.
Replacing every device at once can expand equipment cost, rewiring work and the cutover window. FXS access separates the timing of endpoint replacement from the decision to modernize the network around it.
Place FXS between analog and SIP
Register analog endpoints through an OpenVox gateway while the upstream calling system operates on SIP or IP-PBX.
Move one endpoint group at a time
Organize cutover work by building, floor, department or operational priority.
Connection architecture
Bridge analog endpoints to SIP.
Existing analog devices connect to FXS ports. The gateway then presents those extensions to the SIP or IP-PBX system, allowing analog and IP users to participate in the same calling environment.
Analog phonesExisting desk, room and service extensions
Fax machinesAnalog fax requirements confirmed during design
SIP platformIP-PBX or UCP registration
IP voice usersSIP phones and software clients
Migration paths
Plan capacity, placement and timing.
Start with device type, quantity, cabling and location. Those inputs determine whether the site needs a small gateway, a building-level design or a phased high-density deployment.
Limited endpoint group
Connect a defined set of analog phones or fax machines without redesigning the entire site.
Device fit and registration
Confirm endpoint type, port count, cabling location, SIP registration and the upstream IP-PBX.
Allow planned growth
Select enough capacity for the current group and credible near-term additions.
Multiple floors or zones
Analog devices are distributed across a building and need a shared connection to the IP voice platform.
Cabling and gateway placement
Map endpoint clusters, equipment rooms and existing analog cabling before choosing capacity.
Central or distributed access
Decide whether one larger gateway or several local gateway points better fit the site.
Large analog estate
A high number of established endpoints must remain operational during platform modernization.
Density and cutover control
Plan gateway capacity, equipment layout, validation and migration batches before changing endpoint groups.
Phased cutover sequence
Group migration work by building, floor, department or operational priority.
The endpoint can stay while the network around it evolves.
A controlled migration inventories the analog estate, places the required FXS capacity, validates calling behavior and then moves endpoint groups according to operational timing.
Inventory
Record device types, quantities, locations, cabling groups and current calling behavior.
Connect
Place FXS gateway capacity between the endpoint estate and SIP.
Validate
Confirm registration, signaling, inbound and outbound calling, fax requirements and upstream platform fit.
Migrate
Replace endpoints later when operational and financial timing supports it.
Match FXS capacity to devices, cabling and migration stages.
OpenVox FXS gateway families connect analog phones and other analog devices to SIP/IP-PBX systems, covering smaller endpoint groups through high-density access requirements.
iAG802
8-port FXS gateway for connecting analog phones and fax devices to SIP platforms with concurrent voice and fax processing.
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MAG1000 Series Analog Gateway
Compact 16/24/32-port FXS/FXO analog gateway for space-conscious VoIP deployments that need flexible analog endpoint and trunk connectivity.
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UCP1600
Unified Communication Platform (UCP) is the ideal solution to integrate data, voice and video in one product for small and medium-sized enterprises, which can be used in scenarios such as government and enterprise call systems, commercial call centers, and dispatch center industries.
View productProven analog access at every scale.
Small through high-density gateway roles
OpenVox product documentation covers FXS devices and modules for different analog endpoint densities.
Proof chips
- FXS ACCESS
Analog and SIP users in one system
UCP documentation includes analog phones, fax machines, SIP phones and software endpoints within documented deployments.
Proof chips
- MIXED VOICE
Existing analog phones retained
An OpenVox deployment used IAG802 gateways to connect existing office analog phones while introducing an IP calling system without large-scale rewiring.
Proof chips
- DEPLOYMENT
Compatibility confirmed before selection
Device type, signaling, fax behavior and upstream system requirements are assessed before the final gateway model is chosen.
Proof chips
- PROJECT FIT
Build a staged analog-to-IP voice plan.
Share device types, quantities, locations, cabling, fax requirements and the target SIP or IP-PBX system. OpenVox can help map FXS capacity, validation and cutover stages.