I'm running CCME 4.0 and can set up a 3 way conference for internal numbers but I can establish a conference call with an external number - the phone just displays "Can not create conference"
I'm assuming it's possible but I've just missed a step somewhere - any suggestions?
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This sounds like a Transcoding issue. Have a look at this good doc that explains the need for DSP resources for Conferencing External Parties;
Hope this helps!
You were right on the money. Thanks for the link, it was very helpful