It's comforting (in a strange sort of way) that other users are having the same problems we are with the 5302.
Our latest one is a little more worrying. We have a number of sets that stopped working for no apparent reason and flash the DHCP error LED sequence.
Wireshark shows that the sets are obtaining their first DHCP address, releasing it and are supposed to hop to the voice vlan as instructed via option 125 where they request an address from the 3300. Only problem now is they release the first address and dissapear completley, they just sit there flashing the LED's.
The inter-digit timer can't be changed on the surface but is passed down via TFTP in a text file when the phone registers (system profile / device profile) so in theory it can be changed however make it longer and users will have to terminate with #, make it too short and your set tries to connect the call with a partial number string. Not elegant sets at all although it seems a lot of the issues with the 5302 are due to the limitations of SIP.
A MiNet version of this phone would be ideal, i'll be very interested to see the 5304 in the flesh which is rumored to be MiNet. By the sounds of things this would be a perfect entry level business set.
I could go on all day about issues with these...even if the phone is marketed as basic it should at the very least have the same features as a basic ONS line - it's way short of that with the current firmware.