: Digital Signal Processor runtime microcode regulating voice compression codecs (G.711, G.729) and acoustic echo cancellation.
On the phone, perform a "hard reset" (Hold # while powering on, then dial 123456789*0# ) to force it to look for the new firmware on the TFTP server. cmterm 7941 7961 sip 8 5 4 zipl
This file is a "CMTERM" (Cisco Media Terminal) package designed specifically for the . When the line buttons flash in sequence, release
When the line buttons flash in sequence, release the key and press: 1 2 3 4 5 6 7 8 9 * 0 # . Plug the cable back in while holding down the # key
: This error indicates a file corruption or an invalid upgrade path. To resolve this, perform a factory reset: Unplug the power/PoE cable. Plug the cable back in while holding down the # key.
These older phones do not support the latest encrypted voice protocols.