I beleave SIP providers will not mannage the Caller ID info, If you have not told the SIP provider what you want the ID to be then they would probably leave it blank, if that is the case then the ID info will be what ever the UC has provided. This at least was the case for our System. You can modify the caller ID on the UC via CCA under call handling
The only way I can think of that this will work the way you want it to is to do the following:
Have all outbound calls go through the primary SIP number that was allocated by the ITSP
Have the ITSP set on their Session Border Controller that Caller ID for that primary Number
Have only users who want their name instead of company name displayed set to have their number used instead of the Primary number in CCA,
There is potentially another way, although I have never tried it myself and am not sure if it would be sucessfull and would most likely require heavy CLI adjustment to the system, and this would be using translation rules/profiles to carry it out... I suspect this might be the way Paolo does it with his scripts which is kind of groovy.
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