These are the instructions which appeared on a another forum. I've followed these to the letter, and have had no luck. Even making the changes described below, when I use my landline to call my GV number, still only the number shows up, not the name. However, the name does show up on the Callcentric dashboard on their website. Any help would be appreciated!
Callcentric and Google Voice Setup Guide (with CNAM)
With several now asking for setup instructions for using Callcentric (CC) Caller ID Name (CNAM) in conjunction with Google Voice (GV), here is a general guide with basic setup information to achieve this goal. This post can be edited when necessary.
Overview
Your friend calling your GV Number ==> GV Forwards to your CC Number ==> CC Forwards call to your OBi
Account Setup:
Purchase the OBi. Any of the existing OBi models 100, 110, or 202 will work.
Sign-up for a Google Voice Account, unless you have already done so.
Configure the OBi for your GV account using the instructions located here.
Sign-up for a Callcentric Free Phone Number, unless you have already done so.
CC's Free Phone Number presently incurs a $1.50 monthly fee.
This CC fee offers 911 service through CC if setup correctly on the OBi. For more information, see What about 911? (Thanks Jimates)
Write down the account information provided to you by CC during sign-up.
Enable CNAM on your CC Account. (Thanks MRTT)
Within Google Voice's Account -> Settings -> Phones:
Add your CC Phone Number (516/631/845/914/917) to your GV account
Un-check Google Chat as a forwarding phone
Check your Callcentric number as a forwarding phone
Inside your OBi 100/110/202:
Choose which Voice Service you will use with CC (SP1, SP2, SP3, or SP4)
Configure the following based on which SP/Profile you chose to use with CC:
Service Providers > ITSP Profile X > General -> Name: Callcentric
Service Providers > ITSP Profile X > SIP -> ProxyServer:
callcentric.com Service Providers > ITSP Profile X > SIP -> RegistrarServer:
callcentric.com Service Providers > ITSP Profile X > SIP -> UserAgentDomain:
callcentric.com Service Providers > ITSP Profile X > SIP -> OutboundProxy:
callcentric.com Voice Services > SPX Service -> AuthUserName: 1777nnnnnnnn
Voice Services > SPX Service -> AuthPassword: yourCCpassword
Substitute your personal setup details with the above green fields
Make sure you are entering your CC 1777 account number and not your CC phone number for AuthUserName
Ask someone to place a call to your GV number to test your setup.
Troubleshooting:
1) Make sure that your GV Number is set to Forward to your CC Number (Area Code 917/914/845/631/516)
2) Make sure that your GV Number is not set to Forward to Google Chat
3) Make sure that CC is successfully registering (Status -> System Status)
Following these steps, you "should" be able to view Caller ID Names on your incoming calls. If not, let us know, and we will do our best to quickly find someone to blame. Cheesy For $1.50 per month, you now have CC incoming Caller ID Name, GV incoming/outgoing calls (free until end of 2012), and CC 911 service if setup correctly.