Dear Colleagues, I have 2 phones Cisco 12SP+ connected to my asterisk box 1.2.6 and SCCP channel version: 20060408. When a call is generated no audio pass through the phones, neither if i call from a 12SP+ to another nor calling between 12SP and other phone (ex. an x-lite). Only sometimes works fine. What am I doing wrong? Thank you for your help.