Uplink with Asterisk 1.4 in Uplink Skype to SIP Adapter Posted August 21, 2010 I tried to edit my previous post to add the following, but the system said I didn't have adequate permission - so please excuse my replying to my own post. I've partially resolved this. It turned out that the Uplink sound driver was muted both for playback and record. To un-mute these, I used the following procedure: Double-click the Volume system tray iconThe Play Control panel opens From the Options menu, choose PropertiesThe Properties dialog box opens From the Mixer list, choose Uplink then select the Playback radio button then click OKThe playback properties for the Uplink driver are shown Ensure Mute All and the individual Mute checkboxes are cleared Repeat steps 2 to 4 for the Record properties Skype now reacts to incoming and outgoing calls. However, no audio passes in either direction and Skype drops the calls after a few seconds. For outgoing calls, Skype shows a message asking me to check that my microphone is connected. I suspect that there's a codec issue. I've configured Asterisk to use GSM, G.711 uLaw, or G.711 ALaw but I don't know how to check which (if any) has been negotiated or even which codecs Uplink can use.