I guess you are right , i have tried it with preview and direct preview with both config (1 and 2) it made no difference .
I was doing a troubleshotting a couple of days ago for one of our customers , and i read the exact message you were talking about "If you use Outbound Option, set Call Waiting to On; otherwise,set it to Off." so i set it to 2 and it made no difference , after i solved the problem i checked the system and it was working fine , then i decided to do a test and return it back to 1 and it made no difference but i didn't test the predictive dialing so i guess it is only required for this.
Configuring Cloud Connected PSTN (CCP) – Easy as 1-2-3!
STEP 1: PREPARE
Before you can configure your CCP in Control Hub, you must procure PSTN services from an authorized Webex Calling CCP Partn...
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