This worked for me, I was expecting to ping the interface (it didn't happen), nevertheless my tftp (Tftpd64) was able to communicate with the AP. Thanks

Great post!! thanks man for sharing your knowledge!!!

This's worked for me, my TELCO provider is AXTEL, and this was the voice class TAC found out: voice class custom-cptone CPTONE-AXTEL dualtone disconnect  frequency 425  cadence 510 510There were some other commands added to the voice ports, although ...