On 11th November 2020, we discovered an issue where some Voice API and In-App Voice calls processed in our London Data Centre experienced media timeouts, causing calls to be terminated unexpectedly. There was limited customer impact between 09:35 and 10:21 UTC, affecting a small number of calls processed in our London Data Centre. This issue did not impact other SIP traffic.
This issue was caused by an internal network routing error during routine maintenance, causing media traffic not to leave the Vonage API platform. After 30 seconds of no media traffic, the call is terminated by the Vonage API Platform.