The earliest recollection of this bug is traced back to PAN-OS 10.1.9-h3 - November 18, 2024. This bug is fixed in PAN-OS versions 10.2.5, 10.1.9-h3, 11.0.2, 11.0.1-h2. Fixed an issue where RTP/RTCP packets were dropped for SIP calls by SIP ALG when the source NAT translation type was persistent Dynamic IP And Port . For more information: https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-9-known-and-addressed-issues/pan-os-10-1-9-h3-addressed-issues https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-release-notes/pan-os-10-2-5-known-and-addressed-issues/pan-os-10-2-5-addressed-issues https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-release-notes/pan-os-11-0-1-known-and-addressed-issues/pan-os-11-0-1-h2-addressed-issues https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-release-notes/pan-os-11-0-2-known-and-addressed-issues/pan-os-11-0-2-addressed-issues