Exits

No answer

The exit you configure here will be taken when the forwarded call leg does not connect because the destination did not accept the call. This includes:

A busy signal.
The call is declined at the destination.
The call is not answered before the ringing timeout expires.
The destination network, PBX, or SIP trunk refuses the call or refuses the transfer while the dial attempt is in progress, i.e., a SIP-level rejection response received after the call was actually dialed out.

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Note
A refusal from the destination side is not treated as a component error. Even when the refusal comes from the destination network rather than from a person declining the call, the flow follows the No answer exit, not the Error Handling exit. Configure the No answer exit if you need fallback routing for calls the destination will not accept.

Invalid Number

The exit you configure here will be taken when the call cannot be dialed at all. The forward is never placed because the destination number cannot be reached. This includes:

The destination number is empty or is not in a valid format.
The destination number is refused by the telephony provider as not dialable.
The destination is not permitted for outbound dialing on your account, for example because of geographic or destination restrictions.

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Note
Because the destination is never contacted, this exit tells you nothing about the state of the destination itself. A correctly formatted number that is dialed but turns out to be unassigned, powered off, or out of coverage does not follow this exit — the destination network is reached, so the flow follows the No answer exit. Use Invalid Number for number-format and account-configuration problems, and No answer for anything that depends on the destination.

Error Handling

The Error Handling exit covers failures inside the component itself, such as an unexpected exception or a failure to reach an internal Talkdesk service while setting up the forward. Conditions originating at the destination: busy, declined, unanswered, refused by the destination network, or an invalid or unreachable number are not component errors and follow the No answer or Invalid Number exits instead.