When should a company stay on On-Premise PBX / Five9 Legacy instead of switching to Aircall Cloud Phone System?

Staying on On-Premise PBX / Five9 Legacy is recommended if your one-time onboarding, custom API re-engineering, or contract termination costs exceed the 12-to-24 month subscription difference.

⚡ Evaluation Driver: Slow CRM call logging, per-minute trunking overages & hardware maintenance Illustrative Model (Editable) • Oct 2026

On-Premise PBX / Five9 Legacy vs Aircall Cloud Phone System: TCO & CSV Schema

Q: How do I map On-Premise PBX / Five9 Legacy CSV headers to Aircall Cloud Phone System import format?

Exported On-Premise PBX / Five9 Legacy CSV columns (Agent_Extension, Full_Name, SIP_Trunk_ID, Queue_Department) map directly to Aircall Cloud Phone System target columns (user_number, name, line_id, team_routing) using the local browser CSV header mapper on this page.

12〜36ヶ月の総所有コスト（初期移行コスト含む）を無料で試算。年払い割引とマルチカレンシー決済の最適化を組み合わせ、ブラウザ内で安全にCSVヘッダーをマッピングできます。

1. 総所有コスト (TCO) ＆コスト最適化シミュレーター

利用規模、請求サイクル、初期移行コストを設定して試算

Sales & Support Cloud Call Center

Call Center Agents:

請求プラン

比較期間

初期移行コスト ($)

現在: On-Premise PBX / Five9 Legacy

--/mo

Total TCO: --

Base $120 + $/unit:

代替案: Aircall Cloud Phone System

--/mo

Total TCO (incl. switch): --

Base $0 + $/unit:

⚙️ Credit / Tier Complexity Multiplier (for Credit Bundles & Tiered Plans):

Pricing Methodology Note: Because SaaS vendors often price via stepped tiers, email/contact brackets, or variable credit bundles, use the editable $/unit inputs and Credit Multiplier above to match your exact contract quote. Verify published tier rules at Aircall Cloud Phone System Official Pricing & Docs ↗.

Estimated Net TCO Difference

Break-even payback: --

Formula: --

Evaluating...

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Aircall Cloud Phone System 公式サイトで最新料金を確認する →

2. ローカルCSVヘッダーマッパー

Tabular CSV Headers Only

On-Premise PBX / Five9 Legacy から出力したCSV列名をブラウザ内で Aircall Cloud Phone System 形式に変換します（※CSVのヘッダー行のみを変換します）。

⚠️ Import Readiness & Consent Warning: Renaming CSV column headers does NOT make a file automatically import-ready. Custom attributes must be created in the target platform first, and unsubscribed/opt-out lists must be verified separately to preserve GDPR consent status. Does not convert JSON workflow blueprints.

Source (On-Premise PBX / Five9 Legacy)		Target (Aircall Cloud Phone System)	Field Type / Note
Agent_Extension	→	user_number	Documented System Field
Full_Name	→	name	Documented System Field
SIP_Trunk_ID	→	line_id	Documented System Field
Queue_Department	→	team_routing	Documented System Field

Input Sample CSV (Max 5,000 rows): Escape formulas (=,+,-,@)

Mapped CSV Output Preview:

✅ Aircall Cloud Phone System への移行が適している場合

Your primary cost driver is Slow CRM call logging, per-minute trunking overages & hardware maintenance and your monthly volume exceeds the break-even threshold shown above.
Your team can complete CSV data import and staff onboarding within your budgeted switching cost without disrupting active workflows.
You have verified that Aircall Cloud Phone System's current plan tier supports your required integrations and regional compliance rules.

✋ On-Premise PBX / Five9 Legacy を継続すべき場合

Your one-time migration, custom API re-engineering, or staff retraining costs exceed the 12-to-24 month subscription difference.
You are locked into a multi-year agreement on On-Premise PBX / Five9 Legacy with early termination penalties.
Your workflow depends on custom legacy plugins that are not yet supported by Aircall Cloud Phone System.

3. Technical Sensitivity Benchmark: On-Premise PBX / Five9 Legacy vs Aircall Cloud Phone System

Schema Columns Mapped: 4 fields

The table below models 12-month Total Cost of Ownership across three volume tiers for Call Center Agents (including a baseline $150 one-time switching cost on the alternative plan). For credit-heavy or non-linear tier plans, use the interactive Credit Multiplier above.

Volume Scenario (Call Center Agents)	Current (On-Premise PBX / Five9 Legacy)	Alternative (Aircall Cloud Phone System)	12-Mo Net TCO Outcome
Low Scale (0.5x) (6 Call Center Agents)	$630/mo ($7,560/yr)	$180/mo ($2,310/yr incl. $150 switch)	+$5,250 net reduction
Default Baseline (1.0x) (12 Call Center Agents)	$1,140/mo ($13,680/yr)	$360/mo ($4,470/yr incl. $150 switch)	+$9,210 net reduction
High / Enterprise Scale (2.5x) (30 Call Center Agents)	$2,670/mo ($32,040/yr)	$900/mo ($10,950/yr incl. $150 switch)	+$21,090 net reduction

よくある質問 (FAQ) とTCO算出ロジック

How is Total Cost of Ownership (TCO) calculated between On-Premise PBX / Five9 Legacy and Aircall Cloud Phone System?

SwitchBridge models On-Premise PBX / Five9 Legacy (illustrative base $120/mo + $85.0 per Call Center Agents) against Aircall Cloud Phone System (base $0/mo + $30.0 per Call Center Agents), adding one-time switching costs and billing cycle adjustments. At a sample scenario of 12 Call Center Agents, estimated monthly costs are ~$1140/mo vs ~$360/mo before switching expenses.

How do I map On-Premise PBX / Five9 Legacy CSV headers to Aircall Cloud Phone System import format?

Exported On-Premise PBX / Five9 Legacy CSV columns (Agent_Extension, Full_Name, SIP_Trunk_ID, Queue_Department) map to Aircall Cloud Phone System target columns (user_number, name, line_id, team_routing) using the local browser CSV header mapper above. Custom attributes must be defined in Aircall Cloud Phone System prior to import.

Is SwitchBridge free compared to paid SaaS deal clubs?

Yes. Unlike gated SaaS clubs that charge $199–$499/year for membership, all 61 SwitchBridge TCO calculators and local CSV schema mappers are 100% free ($0 forever) and require no account registration.