T22P Speaker Muted after Firmware Upgrade?

[Navglyr]

For the past month, I've been trying to set up some t22p phones with freepbx. I have 5 phones, but I've only been trying to set one up one. I finally got my routing and settings in freepbx the way I wanted them, but I've run into an issue I can't seem to solve. I upgraded the firmware on the phone to the newest (7.73.0.50), and now the speaker does not ring audibly and pressing the speakerphone button does not produce any sound. It's almost as though the speaker has been disconnected.

In an attempt to isolate the problem, I installed a second phone with older firmware. I reset it to factory settings, verified that the speaker worked and then upgraded the firmware to 7.73.0.50. Again, the speaker stopped working. I downgraded the firmware back to 7.70.0.120, and the speaker is still seemingly disconnected.

I have thoroughly verified that DND is not enabled and made sure that my ringtone is not set to silent. I have also increased the ringer volume as high as it will go. Am I missing something? Is this a known issue? Any help would be appreciated.