On-Premise PBX / Five9 Legacy vs Aircall Cloud Phone System
Estimate what moving from On-Premise PBX / Five9 Legacy to Aircall Cloud Phone System costs over 12 to 36 months, including the one-time switch. Then remap your exported CSV headers.
Why teams look at this switch: Slow CRM call logging, per-minute trunking overages & hardware maintenance
Cost calculator
CSV header mapper
Rename exported On-Premise PBX / Five9 Legacy column headers to suggested Aircall Cloud Phone System column names, for reporting or manual data preparation. Not an official Aircall Cloud Phone System import format. It runs in your browser; only headers change.
Renamed headers do not make a file import-ready. Compare the result with Aircall Cloud Phone System's import template and create any custom fields there first.
| On-Premise PBX / Five9 Legacy column | Aircall Cloud Phone System column | Field type |
|---|---|---|
| Agent_Extension | user_number | Suggested |
| Full_Name | name | Suggested |
| SIP_Trunk_ID | line_id | Custom field, create it first |
| Queue_Department | team_routing | Custom field, create it first |
When moving to Aircall Cloud Phone System makes sense
- Your main cost driver is Slow CRM call logging, per-minute trunking overages & hardware maintenance, and your volume is past the break-even point above.
- Your team can finish the CSV import and onboarding within the switching budget you entered.
- You have checked that Aircall Cloud Phone System's plan covers the integrations and compliance rules you need.
When staying on On-Premise PBX / Five9 Legacy is the better call
- The one-time migration, re-integration or retraining cost is larger than 12 to 24 months of savings.
- You are inside a multi-year On-Premise PBX / Five9 Legacy contract with early-termination fees.
- Your workflow relies on add-ons or features Aircall Cloud Phone System does not support yet.
How the result changes with volume
Twelve-month totals at half, default and double volume, using the default pricing model and a $150 switching cost.
| Volume (Call Center Agents) | On-Premise PBX / Five9 Legacy | Aircall Cloud Phone System | 12-month difference |
|---|---|---|---|
| 50% volume (6) | $630/mo | $180/mo | +$5,250 |
| Default volume (12) | $1,140/mo | $360/mo | +$9,210 |
| 200% volume (24) | $2,160/mo | $720/mo | +$17,130 |
Questions
How is the total cost of On-Premise PBX / Five9 Legacy and Aircall Cloud Phone System compared?
Each side's monthly cost is multiplied by the months in the horizon, and the one-time switching cost is added to Aircall Cloud Phone System. At the default volume (Call Center Agents: 12), the model gives about $1,140 per month for On-Premise PBX / Five9 Legacy and $360 per month for Aircall Cloud Phone System.
How do On-Premise PBX / Five9 Legacy CSV headers map to Aircall Cloud Phone System?
The mapper renames On-Premise PBX / Five9 Legacy columns (Agent_Extension, Full_Name, SIP_Trunk_ID, Queue_Department) to Aircall Cloud Phone System columns (user_number, name, line_id, team_routing) in your browser. Custom fields must exist in Aircall Cloud Phone System before you import.
When should a company stay on On-Premise PBX / Five9 Legacy?
Stay if the one-time switching, integration or contract-exit cost is larger than the savings over the horizon you care about. The calculator shows that case as a negative result.