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 the names Aircall Cloud Phone System expects. It runs in your browser. Only headers change and values are kept.
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.