Understanding and Resolving Exotel API Error Code 34009 When Whitelisting NDNC Numbers
Introduction
Integrating communication APIs like Exotel can streamline your outbound calling processes, but occasional roadblocks can be confusing. A common issue users face is handling calls to numbers registered on the National Do Not Call (NDNC) registry. Specifically, when attempting to whitelist a number through inbound verification, some users encounter persistent errors, notably the Error Code 34009. This article aims to clarify this process, explore potential pitfalls, and provide best practices for successful implementation.
Overview of the Whitelisting Process for NDNC Numbers
In regions where the NDNC registry is enforced, telecommunication providers and API services like Exotel implement safeguards to prevent unsolicited calls. To make outbound calls to NDNC-listed numbers, special procedures—often referred to as “whitelisting”—must be followed.
Typically, the whitelisting process involves a verification step:
- The owner of the NDNC-listed number makes an inbound call to a designated number provided by the service.
- Upon successful verification, the number is approved for transactional outbound calls, bypassing NDNC restrictions.
Common Implementation Approach
The standard method involves instructing the number owner to call your designated Exotel number (referred to as exophone). This inbound call is intended to serve as proof of consent. Once received, the system should recognize the verification and whitelist the number accordingly.
Troubleshooting the Error Code 34009
Despite following these steps, some users encounter persistent errors when attempting outbound calls to the whitelisted number. The specific error code 34009, accompanied by a 403 Forbidden response, indicates that the request is being blocked due to strategic restrictions—most often due to the number not being recognized as whitelisted at the time of the call attempt.
Potential Causes and Considerations
-
Verification Delay:
After the owner makes the inbound verification call, it may take some time for the system to process and update the status of the number in the whitelist. Attempting outbound calls immediately might result in errors. -
Account Type Restrictions:
Certain features, especially NDNC compliance options like whitelisting, may be limited or unavailable on trial or limited accounts. Confirm whether your account type supports this functionality. -
Incomplete Verification Procedure:
Ensure that the inbound call was correctly registered and processed by Exotel. Sometimes, specific configurations or failures in the IVR process can prevent
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