The SMS could not be delivered to the end user's handset for an unknown reason. IntermediateĮrror delivering SMS to handset (reason unknown) If the gateway responds with further information (including successful delivery to handset or delivery failure), the status is updated. The SMS was delivered to the end user's phone. Telesign blocks a message if it is being sent to a phone number that is on a global blocklist.
This is due to your prior submitted request to blocklist this phone number. Telesign blocked the call before it was placed. The line was busy when the call tried to reach the end user’s device.
Typically this occurs when Telesign’s upstream providers fail to complete the call. The verification call has not yet been attempted. If you retrieve status info later, it will resolve to a different status code. You get back an immediate response from Telesign when you make a request, usually with this status. The call was answered by the end user or voicemail.
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