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Glossary · Call centre operations

What is Warm transfer?

  • Also called: attended transfer, consultative transfer

Reviewed by Sujan ThapaliyaLast updated

Definition

A warm transfer is one where the agent speaks to the receiving colleague before handing the caller over, explaining who is calling and why. The caller waits briefly, then arrives with context rather than starting again from the beginning.
The three STIR/SHAKEN attestation levels, which underpin how warm transfer behaves in practice: A asserts both that the carrier knows the customer and that the customer may use the calling number, B asserts the customer only, and C asserts neither. A shared number pool can reach B at best, which is why number ownership keeps recurring in these definitions.
Attestation is the backdrop to most caller-ID and deliverability terms, warm transfer included.

In practice

How warm transfer actually works

The alternative — a cold or blind transfer — pushes the call through without introduction. It is faster for the agent and worse for everyone else, because the caller repeats themselves and the receiving agent starts cold.

The measurable cost of cold transfers shows up in handle time and in repeat contacts. Repeating an account number and a problem description adds a minute or two to every transferred call, and a meaningful share of transferred callers give up rather than repeat themselves.

Warm transfer is worth insisting on wherever the receiving party needs context: escalations, complaints, anything with a case history, and any handover to a named person.

Worked example

A cold transfer costs the caller roughly 60 to 90 seconds of repeating themselves and the receiving agent the same again. Twenty seconds of introduction removes both.

Warm transfer: common questions

What is the difference between a warm and a cold transfer?
In a warm transfer the agent briefs the receiving colleague first. In a cold transfer the call is pushed straight through, and the caller explains themselves again.
Does the caller hear the introduction?
Not in a properly executed warm transfer. The caller is placed on hold while the two agents speak, then brought into the call once the handover is agreed.
When is a cold transfer acceptable?
When routing is genuinely the only issue — a caller who dialled the wrong department and needs no explanation. Anything with a history should be warm.

Sources

  1. Combating Spoofed Robocalls with Caller ID Authentication — Federal Communications CommissionThe STIR/SHAKEN framework, the attestation levels carriers sign calls with, and the mandate requiring providers to authenticate caller ID.
  2. 47 U.S.C. § 227 — Restrictions on the use of telephone equipment — Cornell Legal Information InstituteThe Telephone Consumer Protection Act itself — the consent requirements, calling-hours limits, and private right of action.
  3. ITU-T Recommendation E.164 — The international public telecommunication numbering plan — International Telecommunication UnionThe international number format, the 15-digit maximum, and how country codes and national numbers compose.

See warm transfer in the product

A call queue holds inbound callers in order and distributes them to whichever agent frees up next, instead of ringing one phone and failing. A callback option lets the caller keep their place and hang up, which is what actually reduces abandoned calls.

Explore call queuesGet early access