Cisco c900 15.9

https://software.cisco.com/download/home/286315020/type/280805680/release/15.9.3M2

https://www.cisco.com/c/en/us/td/docs/routers/access/800/829/15-9-3M-Release-Note.html

https://www.cisco.com/c/en/us/support/routers/940-integrated-services-router/model.html

https://software.cisco.com/download/release.html?mdfid=286287094&softwareid=280805680

https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/content/dam/en/us/td/docs/ios-xml/ios/15-9m/release/notes/15-9-3-m-rel-notes.html.xml

https://www.cisco.com/c/en/us/td/docs/routers/access/800/829/15-9-3M1-Release-Note.html

https://www.cisco.com/c/en/us/products/collateral/routers/900-series-integrated-services-routers-isr/datasheet-c78-741615.html

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/15-8m/release/notes/15-8-3-m-rel-notes.html

https://community.cisco.com/t5/routing/qos-support-on-lan-ports-of-cisco-900-and-1000-routers/td-p/4493323