The switch port that I am connecting the router to has the config
interface FastEthernet1/8 switchport mode access authentication event fail action authorize vlan 6 authentication event server dead action authorize vlan 15 authentication event no...
Just in case someone stumbles across this dead thread in the future (like I did). The way to make this work is to changevoice register pool 1id mac 0000.0000.0000number 1 dn 1dtmf-relay rtp-nteusername 1111 password testtovoice register pool 1id d...
Just to provide an example. I had a config that looked like this.
voice register pool 4 id mac 0000.0000.0000 number 1 dn 4
dtmf-relay sip-notify
username 1122 password 3344
and it needed to change to
voice register pool 4id device-id-name 1...
I had tried increasing the timeout but the result was the same. From my understanding the 819 should have no problem authenticating against this switch.
I was using 15.4(3)M3 and then I tried upgrading to 15.6(3)M1 even though the release notes didn't indicate any sort of 802.1x fix. The result was the same.