Dear,
I have more than 6 years of experience in VoIP field, mostly on Cisco CUCM and UCCX implementation based with Cisco SCCP and SIP phones and also on third party SIP phones, hard or softphones.
I did a lot of Cisco IP phone firmware upgrades/downgrades so this task want be a problem for me.
Hope to hear feedback from you. I put this low price because this is my first bid and I hope that this will help to get my first job.
You can find my experience on my profile.
regards
Tomislav