Use a gVoice account for default outgoing calls, without inbound calls

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drgeoff:
Perhaps you are one of the many people who don't understand a fundamental difference between Caller ID (number) and Caller ID Name.

POTS trunk networks carry Caller ID number from the caller's phone service provider to the callee's phone service provider as a digital message as part of the call setup signalling.  The callee's phone service provider converts that to modem type tones for analogue transmission over the local loop to the callee's phone. (Or as a digital message is the SIP signalling if the callee has a SIP VoiP service.)

Those trunk networks have no provision to carry Caller ID Name.  Where the callee's phone service provider sends a Caller ID Name to the callee's phone it obtains that name by a database lookup on the Caller ID number.  Some service providers do a lookup and some don't (eg GV).  Moreover there is no single industry wide database. It is up to the callee's service provider whether to obtain a name and if it does, where to get it from.

So, you as caller have no direct control over what name if any will be displayed on your callee's phone.  There may be means to increase the probability that various databases contain the name that you would wish to be associated with your number.  But nothing you do on your OBi or your GV account has any impact.

SteveInWA:
...adding to drgeoff's explanation, and specific to Google Voice:  you cannot set caller ID name.  Your description of doing something with caller ID name while the numbers were with another service provider rarely works.  Generally, CNAM may be reset to nothing when a number is ported, or the old CNAM may remain, but this is entirely up to the CNAM database (LIDB) providers.  Your ported numbers may retain their old CNAM information for some undetermined time, and then suddenly their CNAM LIDB entries may be deleted.  They will not respond to requests from end users; only authorized service providers can do that.

Aside from that, your plan to have multiple people call out or receive calls on the same Google Voice number is not going to work.  AFAIK, you can only have two simultaneous calls (channels) at a time.

Whatever modest amount of money you may be saving by using Google Voice is easily offset by these limitations. Use a paid commercial SIP VoIP Internet Telephone Service Provider (ITSP) instead of Google Voice.  You'll gain control of CNAM, be able to set up as many extensions as you need, configure them for either simultaneous ringing or a hunt group, set up an IVR, etc.

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