GLOBAL PAYMENTS KNOWLEDGEISO 20022 / SWIFT / SEPA / MT / MX
PAYMENTSSIGNAL

The interactive academy for the standards, messages, and rails that move money.

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IMPS (INDIA, NPCI)

Address does not resolve: an IMPS transfer that fails instantly

Trigger: The mobile number and MMID do not resolve to a valid account, so the IMPS transfer cannot be applied.

Contributor Shubham Mathure

What operations sees first: An instant transfer fails within seconds; the payer is refunded and nothing settles.

WHERE IS THE MONEY?

Never left Riya's account — the transfer failed before any settlement.

DID SETTLEMENT HAPPEN?

No settlement; the address never resolved to an account.

WHO ACTS NEXT?

Riya Riya confirms Arjun's mobile number and MMID (or uses account number and IFSC) and retries.

PLAY THE EXCEPTION

Trigger: The mobile number and MMID Riya used do not resolve to a valid account — the MMID is wrong, or the number is not registered for IMPS at any bank.

STEP 1 / 5MESSAGE

Riya instructs Bank Alfa using Arjun's mobile number

Riya (payer) → Bank Alfa (remitter bank)

Riya sends INR 3,000 late at night from her banking app, addressing Arjun by his mobile number and MMID (Mobile Money Identifier) instead of an account number and IFSC.

Step 1 of 5: Riya instructs Bank Alfa using Arjun's mobile number

  1. 01Message
    Riya instructs Bank Alfa using Arjun's mobile numberRiya (payer) → Bank Alfa (remitter bank)
  2. 02Posting
    Bank Alfa debits Riya's accountBank Alfa (remitter bank)
  3. 03Message
    Bank Alfa routes the transfer through the NPCI IMPS switchBank Alfa (remitter bank) → IMPS / NPCI switch
  4. 04 · EXCEPTION PATHMessage
    NPCI returns an instant failureIMPS / NPCI switch → Bank Alfa (remitter bank)
  5. 05 · EXCEPTION PATHPosting
    Bank Alfa reverses the debit and refunds RiyaBank Alfa (remitter bank)
  6. OUTCOME
    Funds
    Returned to Riya — the transfer failed before it could be applied to any account.
    Settlement
    No settlement: a failed transfer never enters NPCI's net position, so there is nothing to settle at the RBI.
    Who acts next
    IMPS / NPCI switch — Riya rechecks Arjun's mobile number and MMID — both must be correct and registered for IMPS — then tries again.
Full step-by-step text (works without JavaScript)
  1. 01Message
    Riya instructs Bank Alfa using Arjun's mobile numberRiya (payer) → Bank Alfa (remitter bank)

    Riya sends INR 3,000 late at night from her banking app, addressing Arjun by his mobile number and MMID (Mobile Money Identifier) instead of an account number and IFSC.

  2. 02Posting
    Bank Alfa debits Riya's accountBank Alfa (remitter bank)

    The remitter bank books the debit on its own ledger straight away, so the amount is committed before the transfer is pushed onto the shared IMPS rail.

    • DR Riya's savings account at Bank Alfa — INR 3,000.00
  3. 03Message
    Bank Alfa routes the transfer through the NPCI IMPS switchBank Alfa (remitter bank) → IMPS / NPCI switch

    In real time the remitter bank sends the transfer to NPCI's IMPS switch, which resolves the mobile number and MMID to the right beneficiary bank and forwards it in seconds.

  4. 04 · EXCEPTION PATHMessage
    NPCI returns an instant failureIMPS / NPCI switch → Bank Alfa (remitter bank)

    Because the address does not point to a live account, the switch cannot deliver the transfer and sends a rejection back to the remitter bank straight away.

  5. 05 · EXCEPTION PATHPosting
    Bank Alfa reverses the debit and refunds RiyaBank Alfa (remitter bank)

    The remitter bank credits the amount back to Riya so she is made whole within seconds — an unresolved address means the money simply never leaves the bank.

    • CR Riya's savings account at Bank Alfa — INR 3,000.00
  6. OUTCOME
    Funds
    Returned to Riya — the transfer failed before it could be applied to any account.
    Settlement
    No settlement: a failed transfer never enters NPCI's net position, so there is nothing to settle at the RBI.
    Who acts next
    IMPS / NPCI switch — Riya rechecks Arjun's mobile number and MMID — both must be correct and registered for IMPS — then tries again.

THE TIMELINE

  1. 01Riya
    Instructs an INR 3,000.00 IMPS transfer to Arjun using his mobile number and MMID.
  2. 02IMPS / NPCI
    Cannot resolve the mobile number and MMID to a valid, active account, so it rejects the transfer instantly.

    The address must resolve to a real account; instant rails fail cleanly rather than holding value in limbo.

  3. 03Bank Alfa (remitter bank)
    Reverses any hold so Riya is not debited; nothing settled between the banks.

Resolution: IMPS resolves the beneficiary from the mobile number and MMID before moving money. An unresolved address fails the transfer instantly, all-or-nothing, and the payer is made whole.

LEARN THE CONCEPTS

Sources for this scenario2
  1. Official requirement

    Immediate Payment Service (IMPS) ↗ — National Payments Corporation of India (NPCI) · addressing / MMID

    Describes IMPS, the NPCI-operated instant interbank electronic funds transfer service available 24/7, addressable by account number and IFSC or by mobile number and MMID. · Checked 2026-07-14

    IMPS is the instant interbank rail that UPI is built over.

  2. Simplified educational illustration

    Payments Signal editorial teaching models — Payments Signal

    This site's own simplified teaching models. · Checked 2026-07-12

    What this simplifies: Single-cycle teaching model; participant-specific handling and exact timings vary.

    Used wherever diagrams, scenarios, figures, or example values are didactic constructions rather than sourced facts; every such use carries a simplifications disclosure. All people, companies, banks, and list entries in examples are fictional.