Yealink IP DECT Phone Admin Guide Download
While on a call you can increase/decrease speaker volume using the < and > arrows. Once changed during the call, this level will remain persistent for future calls unless changed again.
Yealink W56P User Guide Download
Yealink W60B & W56H Quick Start Guide Download
See Video on changing Softkey. In this video, changing “Line” Key to “Retrieve” for Park. Press OK, 6, 4, 2Select new functionPress Ok, Back, Back, Back. https://youtu.be/LxCZzD86JC4
Issues appears to be related to SIP ALG despite it being confirmed disabled. Changing these settings seems to correct the issue on affected base/handsets. Features->General Info->Accept SIP Trust Server Only->Enabled Settings->SIP->Local SIP Port->5090