Replace an ISDN or E1/T1 service
Map the current signaling and capacity to the digital or SIP role required by the target carrier service.
Move from ISDN and PSTN to IP voice with confidence.
Preserve existing phones and PBX investments while moving traditional trunks and services toward a SIP-based voice network.
The external trigger
Turn network retirement into a managed migration.
When an operator retires an ISDN or PSTN service, the impact extends beyond the line itself to PBXs, numbers, trunks and analog devices that still depend on it.
The migration must identify every affected service, preserve necessary calling behavior during the transition and establish the correct digital, analog or SIP replacement path.
Keep the existing PBX during transition
Use analog, digital or SIP interworking while the core system remains in service.
Retain phones or fax machines
Use FXS access when validated analog devices must continue on the new IP voice network.
Sequence several locations
Plan each site around its carrier date, local equipment and approved migration window.
Move from external deadline to accepted replacement.
Carrier and regulatory dates must be confirmed for the country and operator involved; the technical plan then follows the affected services.
Confirm the trigger
Verify the operator, service and retirement timeline from an authoritative source.
Map dependencies
Identify trunks, PBXs, numbers and analog devices tied to the service.
Design the target path
Choose digital, analog and SIP roles for the replacement network.
Test and cut over
Validate calling behavior before the traditional service is removed.
Match the OpenVox role to the retiring connection.
The final product combination depends on the current line type, the equipment being retained and the new SIP service.
DGW-L302
Dual-span E1/T1/PRI VoIP gateway for connecting two digital trunks to SIP networks with up to 60 concurrent calls.
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iAG800
Flexible 2/4/8-port FXS/FXO gateway for connecting analog endpoints and PSTN lines to SIP networks.
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ET200X
Modular E1/T1/PRI VoIP gateway platform for 1, 2, or 4 digital spans with up to 120 concurrent channels.
View productVerified evidence for migration.
Country-specific retirement dates must be confirmed with the relevant operator or regulator.
Authoritative dates only
The project confirms the current operator or regulator timeline before publishing urgency claims.
Proof chips
- TRIGGER
Documented trunk options
OpenVox digital products support selectable E1/T1/J1 and signaling roles on documented models.
Proof chips
- DIGITAL
Device and line access
FXS and FXO products support different sides of the analog migration.
Proof chips
- ANALOG
Target network interworking
UCP and gateways support standard SIP connections to documented IP voice environments.
Proof chips
- SIP
Build a controlled switch-off schedule.
Share the country, operator, service type, current PBX, numbers, trunks and analog dependencies. OpenVox can help map the replacement interfaces and validation plan.