Merge pull request #271046 from boris-bazilevskiy/doc-update-feb24

Doc update feb24

Author: prmerger-automator[bot]

articles/communication-services/concepts/telephony/known-limitations-acs-telephony.md

@@ -5,7 +5,7 @@ author: boris-bazilevskiy
 manager: rcole
 services: azure-communication-services
 ms.author: bobazile
-ms.date: 12/05/2023
+ms.date: 04/03/2024
 ms.topic: conceptual
 ms.service: azure-communication-services
 ms.subservice: pstn
@@ -28,8 +28,9 @@ This article provides information about limitations and known issues related to
 - Location-based routing isn't supported.
 - No quality dashboard is available for customers.
 - Enhanced 911 isn't supported.
-- In-band DTMF is not supported, use RFC 2833 DTMF instead.
-- Multiple IP addresses mapped with the same FQDN on the SBC side are not supported.
+- In-band Dual-tone multi-frequency (DTMF) isn't supported. Use RFC 2833 DTMF instead.
+- Multiple IP addresses mapped with the same FQDN on the SBC side aren't supported.
+- Maximum call duration is 30 hours.
 
 ## Next steps