Purchase used cisco voip spa 303 att ringCentral phone. It has been set up for previous user. I do not have att account but do have ringCentral account. Thought being ringCentral phone would be easy.

See if this solution helps from Cisco's website:
https://supportforums.cisco.com/discussion/11385276/spa-303-stuck-initilizing-network

Here is a discussion on the Cisco forums for this.
https://supportforums.cisco.com/thread/2146353

I hope below link will help you

http://www.cisco.com/en/US/products/ps10998/index.html

http://www.cisco.com/en/US/products/ps10998/prod_installation_guides_list.html
go to Cisco SPA 303 3 Line IP Phone topic.

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6789/ps7046/ps11199/qa_c67-613606.html

Please rate this , if you like solution

BEFORE YOU BEGIN, please note the following:
On the Nokia E71 some of VoIP settings are hidden by default, and you will need Nokia's new VoIP SIP application.
This application can be used to configure VoIP settings on your Nokia. You can create new VoIP profiles and modify the existing ones, and create and modify VoIP parameters and NAT/Firewall traversal settings and that are normally not visible on the device UI, such as codec settings and SIP domain-specific NAT/FW settings. It is also possible to save all the VoIP profile settings to a text file. It also enables VoIP over WCDMA which means you can make VoIP call over 3G Internet connection.
Using your PC you can download free Nokia SIP VoIP application from here or you can check Nokia web sitefor latest version.
Extract and install SIS file using Nokia PC Suite software on your PC.
Once installation is complete you will be able to see "SIP VoIP Settings" application under Applications menu on your Nokia, which you will need in STEP 5 of this configuration guide for better voice quallity or enabling VoIP over 3G Internet connection.
Here you can find Nokia E71 SIP settings for voip setup and SIP client configuration guide with VoIPVoIP service.
STEP 1 Go to Tools / Settings / Connection / SIP settings. Create the following profile
Profile Name: VoIPVoIP Service
Profile: IETF Default
Access point: (your WLAN AP name)
Public user name: [email protected] ( Instead of 5551231234 account number example, use the account number assigned to you when signed up for VoIPVoIP service. When recorded your phone will show sip:[email protected] )
Use Compression: No
Registration: "Always on "
Use Security: No

STEP 2 You do not need to enter Proxy Server settings
Proxy Server Address: none
Registrar Server:none
Realm: none
User Name: none

STEP 3 Enter the following for Registrar Server settings
Registrar Server: sip3.voipvoip.com (When recorded your phone will show sip:sip3.voipvoip.com)
Realm: voipvoip.com
User Name: 5551231234 (Instead of 5551231234 account number example, use the account number assigned to you when signed up for VoIPVoIP service. )
Password: Enter the password that you chose when you signed up for the service.
Transport Type: UDP
Port: 5060

STEP 4 Go to Tools / Settings / Connection / Internet Tel. Settings
Create a new profile for "voipvoip"(555123xxxx), name it "voipvoip"
Choose "voipvoip" as Preferred profile
STEP 5 For better voice quality or in order to be able to make VoIP calls over 3G internet connection you need to use Nokia SIP VoIP Application you installed.
Go to Applications on your phone and click on "SIP VoIP Settings" application. Choose VoIP services/VoIPVoIP (or the name of your VoIPVoIP account Internet profile.)
Click on "Profile Settings" and find "Allow VoIP over WCDMA" option and change it to "ON" This change allows VoIP over 3G connection on Nokia phones.
For better voice quality go to Codecs and delete all codecs except G729. There should be only G729 codec left under codecs setting
STEP 6 Reboot your phone. Once your phone is back on it will automatically register to VoIPVoIP.
Once it is registered you can start making calls.
Default call type: To switch between normal GSM calls or VOIP calls, navigate to Tools / Settings / Call / Default call type. Select Cellular to make normal calls to the phone number or Internet to use VoIP to call the number or address
Make Calls!
To dial any phone number that is part of the NANP (North American Numbering Plan), you must dial:
1 + Area Code + Phone number
To dial any phone number that is outside of the NANP (North American Numbering Plan), you must dial:
Country Code + City Code + Phone number
For example if you want to call Brazil (country code 55) phone number in Rio de Janeiro (city code 21) you must dial 5521 and phone number. + sign can also be used and number can be dialed as +5521xxxxxxx


BUT RATHER THAN FOLLOWING THESE PLS CALL TO YOUR CUSTOMER CARE THEY WIL GIVE THE SETTINGS. SAVE THEM. THEN FOLLOW THE INSTRUCTIONS. THIS DOES NOT COST ANY COST. PLEASE TRY THIS

No.
Try 'admin' and "blank".
Try "blank" and 'admin'.
Failing that, do the "reset to factory settings",
and then reconfigure your VOIP settings.

Here are the instructions for configuring these units for 3cx

http://www.3cx.com/sip-phones/cisco-7940.html

http://www.3cx.com/sip-phones/polycom-soundpoint.html

Since the 3cx softphone worked well, I don't see why you couldn't configure each as for 3cx and make them work as well.

ask ur service provider

typically faxing doesn't work on VOIP. i tried many times and sometimes it would go through although it said it didn't. other times it didn't work at all. VOIP has a limited bandwidth and the fax needs to send more info over the line than VOIP makes room for.

to have the best luck, stop all downloads and other network traffic while attempting to fax, so that there are no other programs or devices using the internet. the fax will have its best chance of working that way, although it probably still won't

here are some very good tips as well:
http://chris.pirillo.com/how-to-fax-over-voip-on-the-internet/

Then you need power adapter for Cisco 7960 IP phone ( -40V DC).
Cisco phones work best with Cisco, and sometimes ONLY Cisco switches.

One question which voice gateway you will use for your 7960 VoIP phone calls to go through ?
(AT&T probably supports only their IP Phones with special and usually hidden settings from end user)

Your skypin number should be associated with an account on skype. So all you have to do is to login using the associated account when you turn on your phone, do this by using the phone's controls to enter in your skype account and password.