Keep devices that still serve a purpose
Keep analog phones and fax endpoints in service when project validation confirms they fit the new call design.
Integrate analog devices into your IP voice network.
Keep established analog phones, fax machines, and other endpoints in service while the voice network migrates to SIP. Migrate endpoint groups in stages according to device needs, location, cabling, and operational schedule.
The migration decision
Keep useful analog devices while the IP-PBX advances
Analog phones, fax machines and other established devices can still perform a necessary task even as the voice core migrates to SIP.
Replacing every device at once can increase equipment costs, 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 call system runs on SIP or IP-PBX.
Move one group of endpoints at a time
Organize cutover work by building, floor, department or operational priority.
Connection architecture
Bridging analog endpoints to SIP
Existing analog devices connect to the FXS ports. The gateway then presents these extensions to the SIP or IP-PBX system, allowing analog and IP users to participate in the same call environment.
Migration paths
Plan capacity, placement, and timing.
Start with the device type, quantity, cabling, and location. These parameters 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 adaptation and registration
Confirm the endpoint type, number of ports, wiring location, SIP registration, and upstream IP-PBX.
Allow for planned growth
Select enough capacity for the current group and credible short-term additions.
Multiple floors or zones
Analog devices are spread across a building and require a shared connection to the IP voice platform.
Wiring and gateway placement
Map endpoint clusters, equipment rooms, and existing analog wiring before choosing capacity.
Centralized or distributed access
Decide whether a larger gateway or multiple local gateway points are a better fit for the site.
Large analog estate
A large number of established endpoints must remain operational while the platform is modernized.
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 surrounding network evolves
A controlled migration inventories the analog estate, places the required FXS capacity, validates call behavior, then moves endpoint groups according to operational timing.
Inventory
Record device types, quantities, locations, wiring groups, and current call behavior.
Connect
Place FXS gateway capacity between the endpoint estate and SIP.
Validate
Confirm registration, signaling, inbound and outbound calls, fax requirements, and upstream platform suitability.
Migrate
Replace endpoints later when operational and financial timing allows.
Match FXS capacity to devices, wiring, and migration stages
OpenVox FXS gateway families connect analog phones and other analog devices to SIP/IP-PBX systems, covering small endpoint groups through high-density access requirements.
Proven analog access at every scale
OpenVox product documentation covers FXS devices and modules for different analog endpoint densities.
Gateway roles from small to high density
OpenVox product documentation covers FXS devices and modules for different analog endpoint densities.
Analog and SIP users in one system
UCP documentation includes analog phones, fax machines, SIP phones, and soft endpoints in documented deployments.
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.
Compatibility confirmed before selection
Device type, signaling, fax behavior, and upstream system requirements are assessed before choosing the final gateway model.
Build a step-by-step analog-to-IP voice plan
Share device types, quantities, locations, wiring, fax requirements, and the target SIP or IP-PBX system. OpenVox can help map FXS capacity, validation, and cutover stages.
Related products
OpenVox iAG802 Analog VoIP Gateway
Supports 8 FXS ports; Supports 2 Gigabit Ethernet ports; Uses the standard SIP protocol;
MAG1000 Series Analog Gateway
Supports 16/24/32 FXO/FXS combination ports; uses the standard SIP protocol; compatible with leading IMS/NGN platforms, IPPBX, and SIP servers.
OpenVox MAG2000 Series Analog Gateway
Supports 16/24/32 FXO/FXS combination ports; 4 Gigabit Ethernet ports; Uses standard SIP protocol;
UScale IAD S196 Integrated Access Device
Integrated Access Device (IAD); supports 32-96 analog user channels; seamless migration from traditional analog telephones to modern IP voice networks, ensuring carrier-grade business continuity;
Let’s discuss your project
Describe your requirements. Our team can help you select and plan your OpenVox solution.