Yealink Skype for Business HD IP Phones Administrator Guide356Why is there no sound when the other party picks up the call?If the caller and receiver cannot hear anything - there is no sound at all when the other partypicks up the call, the possible reason could be: the Skype for Business phone cannot send thereal-time transport protocol (RTP) streams, in which audio data is transmitted, to the connectedcall.Try to disable the 180 ring workaround feature. For more information, refer to 180 RingWorkaround on page 176.Why does the Skype for Business phone play the local ringback toneinstead of media when placing a long distance number without plus 0?Ensure that the 180 ring workaround feature is disabled. For more information, refer to 180 RingWorkaround on page 176.Upgrading IssuesWhy doesn’t the Skype for Business phone upgrade firmwaresuccessfully?Do one of the following: Ensure that the target firmware is not the same as the current firmware. Ensure that the target firmware is applicable to the Skype for Business phone model. Ensure that the current or the target firmware is not protected. Ensure that the power is on and the network is available in the process of upgrading. Ensure that the web browser is not closed or refreshed when upgrading firmware via webuser interface. Ensure that the target firmware on the Skype for Business Server is available.
