The Snom M300 is unable to transfer an outbound call or retrieve a call from hold. When you hit the hold or transfer buttons it places the callee on hold but the handset display does not change. This works correctly on an inbound call. I am using an Asterisk platform. I have also upgraded the firmware to version 324 with no change.
Glad that we could be of assistance and that your issue has been resolved.
Thank you. That did resolve the issue.