Start by identifying whether the number is a mobile line, a fixed business line or part of a telephone system. Use the guidance for that service; the same setup method should not be assumed to apply to all three.
Official starting points
Türk Telekom publishes a mobile call-forwarding service page with setup methods and service terms. For a fixed business line, use its business telephone service guidance.
Confirm current eligibility, charges and the method for your line with Türk Telekom. These references explain carrier services; they are not confirmation that a particular Golub Voice destination has been tested with your plan.
Prepare the setup
- Identify the line owner and the exact line being changed.
- Get the intended destination from your Golub Voice setup.
- Decide which condition should forward: all calls, no answer, busy or unreachable, where available.
- Review the corresponding official instructions and the current forwarding or voicemail settings.
- Keep the restoration method before applying a change.
Do not reuse codes or sample numbers from an unrelated line type. Follow the carrier’s current guidance for the number format and activation method.
What to check afterwards
Plan to verify the chosen condition, the expected agent greeting and the fallback when the destination cannot answer. If the line is managed by a business telephone system, check whether an administrator must also adjust that system’s route.
If a setting is rejected, retain the non-sensitive error message and ask Türk Telekom to confirm whether the line and destination are eligible. For agent state and routing checks, continue with Phone setup and forwarding or Troubleshooting.