VoIP change firmware on Cisco 7941 Phone to SIP

Closed - This job posting has been filled and work has been completed.

Job Description

hello we got 2 cisco voip phones we need to flash them with SIP version of firmware. We can set up remote access and linux server for you for TFTP. We tried to do it ourselves but failed, probably as we had wrong files version, we are not experts on Cisco phones.
Please let me know if you know how to do this and if you ever did such modifications? tnx

Skills: voip, linux