System Status

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Possible SMS Delivery Delay
Incident Report for TeleSign System Status

Below you will find the Root Cause Analysis for the incident that occurred on Wednesday, October 9th 2019.

Original Reported Subject: Possible SMS Delivery Delay

Date: Wednesday, October 9th, 2019

Start Time: 09:52 AM UTC

End Time: 10:25 AM UTC


On Wednesday, October 9th customers experienced SMS delivery latency for Verify SMS and SMS API products, and select PhoneID request failures. The incident stared at 09:52 AM UTC and lasted until 10:25 AM UTC.

Root Cause Analysis:

As a result of a network configuration change, access was temporarily blocked to external resources associated with SMS DLR callbacks and select PhoneID requests. As of 09:52 AM UTC, system alerts detected transaction queuing in TeleSign’s data centers, associated with failure to resolve callbacks. In response to system alerts, engineers immediately began work to move traffic and clear queues. Once root cause was identified, network configuration changes were applied to resolve. Impacted data centers required approximately 20 minutes to clear queues associated with the event. The issue was resolved by 10:25 AM UTC, and no further delays were detected. All SMS messages were delivered during the event, however delivery was occurring at a slower rate.

Preventive Measures:

To minimize the risk of, and/or prevent this issue from recurring in the future, TeleSign’s Tech Ops team has taken the following actions:

· Ran additional performance tests of DLR callback services to investigate functionality in negative scenarios.

· Prior to any similar future network configuration adjustments, TeleSign will initiate tests on small testing domains, outside the platform.

We apologize for the inconvenience this may have caused you. Should you have any questions, please don’t hesitate to contact us at

Posted Oct 22, 2019 - 00:34 PDT

Dear Customers and Partners,

Possible SMS delivery has now been restored as of 10:25 AM UTC

We are currently reviewing the root cause and will provide additional information once we have completed the investigation.
Posted Oct 09, 2019 - 03:33 PDT
Dear Customers and Partners,

Our internal monitoring system shows possible intermittent SMS delivery delays starting at 09:55:00 UTC

Our Network Operations team is currently investigating and working on a speedy resolution.

We will inform you once the issue has been remedied.
Posted Oct 09, 2019 - 03:09 PDT
This incident affected: Enterprise Services (SMS Verify) and Standard Services (SMS).