Missing dpma public rpm for digium phone module to below asterisk versions.
Asterisk 13 Certified
Asterisk 15
Asterisk 16 Certified
Since we get the above asterisk version listed while running asterisk-version-switch command.
[root@freepbx ~]# asterisk-version-switch Current version: Asterisk 18.6.0 (LTS) = Long Term Support | (EOL) = End of Life | (S) = Standard Press 1 for Asterisk 13 (EOL)
Press 2 for Asterisk 13 Certified (EOL)
Press 3 for Asterisk 15 (EOL)
Press 4 for Asterisk 16 (S)
Press 5 for Asterisk 16 Certified (LTS)
Press 6 for Asterisk 17 (EOL)
Press 7 for Asterisk 18 (LTS) Press q to exit and not change your Asterisk VersionPick the Asterisk Version you would like to change to: