Keep critical analog services running as POTS lines are phased out.

Replace the line being phased out, not every validated endpoint. Move phones, fax, emergency, and site services to SIP while retaining useful on-site copper infrastructure.

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Keep critical analog services running as POTS lines are phased out.

Analog dependency

Replace the line without disrupting service

A legacy POTS connection may still support a telephone, fax machine, or another analog device with specific call behavior.

The project must identify each dependency, determine whether the device can use FXS access, and validate SIP service before the original line is withdrawn.

VOICE

Analog telephone service

Keep a validated analog telephone in service while the external network migrates to SIP

FAX

Analog fax requirement

Confirm fax behavior, codec, signaling, and provider suitability before migration

SINGLE SITE

Replace a local group of lines

Map devices and numbers in a single office or service location

MULTISITE

Coordinate multiple sites

Sequence line withdrawal and gateway deployment according to each site's schedule

Move from an external deadline to an accepted replacement

Operator withdrawal dates must be confirmed with an authorized source for the country and service concerned

01
Confirm the line change
Check the provider, location, service, and withdrawal schedule
02
Inventory the devices
Record the telephone, fax, number, wiring, and call behavior
03
Test the SIP path
Validate registration, calls, fax, and failure conditions
04
Withdraw the POTS line
Withdraw the old service only after the replacement behavior has been accepted

Match gateway capacity to the full set of devices

OpenVox FXS products cover small groups of devices through high-density requirements; model selection follows device type, quantity, and placement

Keep claims specific to the device and service

No alarm, access control, or regulated critical-device compatibility is claimed without specific evidence

Access for analog telephones and endpoints

OpenVox FXS gateways connect analog telephones and supported analog endpoints to SIP

Fax included in UCP deployment guidance

OpenVox UCP documentation includes fax machines in analog endpoint scenarios

Multiple service environments

OpenVox platforms and gateways support SIP interoperability with documented IP voice systems

Compatibility confirmed per device

Signaling, codec, call behavior, and fax are validated before the old line is withdrawn

Build a verified POTS replacement plan

Share provider schedules, device types, numbers, wiring, fax requirements, and target SIP service. OpenVox can help map FXS capacity and validation steps

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