Missed call notification occurs due to wrong handling of SIP header in Skype for Business Server 2019

Applies to: Skype for Business Server 2019

Symptoms


In Microsoft Skype for Business Server 2019, a Skype for Business client user still receives a missed call notification even though the call was answered by other telephony systems (for example, the Alcatel telephony system).

Resolution


To fix this issue, install the September 2020 cumulative update 7.0.2046.244 for Skype for Business Server 2019, Front End Server and Edge Server.