I am new to voip and am struggling.
I am trying to downgrade the firmware on my iphone from 12.5 to 11.0 because it is not compatible with my routers. Before I continue keep in mind I will not be connecting to the internet at any point in time during this process and I am using a single pacstar router which has 2 routable ports and 4 switch ports and the 7841s only use sip.
I copied the firmware from a usb to my routers flash: I can see they are in there when I do dir | inc 78 (all the file names have 78 in them). I config vlan 40 for voice, and configured a sw as voice and a trunk port that allows all vlans. I configured dhcp, sip, tftp, domain name and hostname. The phone is able to pull an ip from my dhcp and I can ping the phone. When I restart the phone or reset it to default it shows it has an ip, it shows the routers hostname and domain name but then when I look at its status it says no dns. So even though i didn't think I needed a dns i configured one on the router and it's not getting the ip I set as the dns (I used the routers ip which the phone shows it has for the routers ip).
I tried doing the upgrade and create profile command but they say error file deleted flash:/ (then some file that doesnt exist). My supervisor said that error message isn't really important though. But the phone is still not taking the new firmware and downgrading.
