How to configure Cisco Phone 7975g with Asterisk
To work with asterisk Cisco Phone 7975g must be upgraded with SCCP to SIP firmware
1- Download SIP Firmware for Cisco Phone 7975g
2- Configure TFTP server and upload SIP firmware
3- Boot Cisco Phone with SIP firmware after upgrade
4- configure SEP_MACaddress.cnf.xml file
5- Reboot the Cisco Phone .