The problem with dialing from Cisco Jabber is that contacts that are synced from Outlook and/or AD need to be dialed from both Jabber and Mobile phones.
Instead of adding a “9” or pstn prefix to your Outlook contacts or in Active Directory, CUCM can automatically prepend your PSTN prefix when dialing from Jabber.
First, add the application dial rules in CUCM under Call Routing, Dial Rules, Application Dial Rules – Notice “Number Begins With” is blank
Next, you’ll need to grab the file “cmterm-cupc-dialrule-wizard-0.1.cop.sgn” from the Jabber for Windows admin pack, upload to your CUCM cluster and restart tftp services.