I'm trying to upload a custom ringtone to my desk phone and keep getting an error after it asks me to select a slot to save to saying "invalid file format"It does the same thing if I press play, and also if I add it to the MP3 player playlist then tr...

I have an SPA525G2 desk phone that will not pair to certain headsets. Sometimes they do not even show up in the scan list. I updated the firmware to 7.6.2f using the Bluetooth firmware version but it did not help. Hardware version is 2.1.1The headset...