I have the D70 phone. I find the sound very good - especially when using the speakerphone. I did some tests calling into my voicemail and left voice messages to test sound quality. The outgoing sound is not as high quality as the incoming sound. I found my Cisco SPA phones had much better outgoing sound quality. The mic in the receiver very easily picks up air noise when speaking which comes cross as a cheap phone sound. The incoming sound has good bass and clarity.
I am disappointed that I cannot get the sidecar buttons to behave as BLF keys. As mentioned you need the special Asterisk version unavailable through FreePBX to install DPMA. There’s no way that I know of to get the buttons to work as BLF keys through the GUI interface. By adding contacts to the phone, it sets up speed dial entries to the side car but that’s it. There’s no way to code it to watch for the Asterisk hints.
The font is small and hard to read on the screen. Maybe I’m getting old, but it’s not just the fonts. The resolution on the LCD screen is poor. I’m comparing it to the LCD screens on my Cisco SPA504G phones. I can clearly read it, whereas this Digium phone I need to move very close to the screen to see it clearly. There are brightness and contrat buttons but they don’t seem to do much as far as making the letters clearer to read.
The timer comes on when you are on the phone chatting, but the current date/time is only visible when not on a call. There’s a lot of wasted space on the screen where the date/time could easily fit. Especially with such small fonts.
When hanging up the receiver it’s a magnet that actually causes the hangup to occur. There is no switch hook button. I thought that was a nice design.
Overall for the cost I don’t think the phone is worth it unless you had the special Asterisk version that works with the phones. The online GUI interface has some bugs. It’s really lacking functionality/settings. I was expecting a lot more from a 2012 VoIP phone. Since I haven’t been able to get the DPMA working, I cannot comment on that. If I try to install it I get this:
[email protected] modules]# asterisk -rx "module load res_digium_phone.so"
Unable to load module res_digium_phone.so
Command ‘module load res_digium_phone.so’ failed.
Right now the side car is just a list of speed dial buttons.
The GUI Interface is temperamental. Sometimes it will lose settings. I upgraded to the latest version and still lose entire lines/extensions that were provisioned just by simply changing the dial plan on one of the lines. Line 1 never seems to disappear, but all other 5 lines are set back to default and extensions, passwords, station name, etc are all erased.
I’m disappointed in the Digium D70. I definitely expected more. The polished videos make the phone seem excellent but I think there’s much more value going with another brand.