Under "Voice Service Provider List" -> Edit a provider -> Advanced.
Under "From User" key in the phone number that you have already authenticated with you VOIP carrier (i.e. VOIPcheap, VOIPdiscount, etc...)
After that, when you call, the caller ID should show what you've keyed in "From User". However, I believe you need the SIP to be registered for this to work. It also seems that sometimes it does, and sometimes it doesn't.
Marin/Moderator, can you confirm that SIP registration is required for caller ID to work?
Thanks.
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