CW
The Calls Warehouse
Customer Portal
Helpful guide · Existing customer support
PSTN and service changes
Use this when reviewing older phone lines, moving to VoIP, or checking what depends on a line.
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Quick checks
Use this when reviewing older phone lines, moving to VoIP, or checking what depends on a line.
Check what uses the line
Look for phones, alarms, payment terminals, lift phones, door entry, broadband, routers or any legacy equipment.
Confirm the number
If a number matters to the business, confirm it clearly before any service change or migration.
Check broadband suitability
VoIP needs a suitable internet connection. Unreliable broadband should be reviewed before moving key calls.
Avoid last-minute changes
Leaving legacy service changes too late can increase disruption risk, especially where multiple services depend on the same line.
If you are unsure what depends on a line, ask us to review it before making changes.
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