General (info taken from www.voipbuster.com )
    SIP port : 5060
    Registrar : sip.voipbuster.com
    Proxy server : sip.voipbuster.com (or sip1.voipbuster.com)
    Outbound proxy server : leave empty
    Account name : your voipbuster username
    Password : your voipbuster password
    Display name/number : Your voipusername or voipnumber
    Stunserver (option) : stun.voipbuster.com

Use the G.711 codec

NAT Support Parameters

STUN Enable — Yes

STUN Server — stun.voipbuster.com

Once completed click Submit All Changes.

Now click the sub-menu item called Line 1.

You will need to fill in a few options on this screen, these are as follows (You will require your Netspace VOIP details to complete this section):

Proxy and Registration

Proxy— sip.voipbuster.com

Subscriber Information 

• Line Enable: Yes
• SIP Port : portnumber 5060
• Proxy: fill in sip.voipbuster.com
• Register: this is 'Yes'
• Make Call Without Reg: fill in 'Yes'
• Register Expires: this is 3600 seconds
• Ans Call Without Reg: fill in 'No'
• Display name: you can fill-in e.g. your name or telephonenumber, this name will be displayed in the phone screen of the person you are calling
• User ID: fill in your username, this is the username you used for the registration of your VoipBuster-account
• Password: fill in your password, this is the password you used for the registration of your VoipBuster-account
• Use Auth ID: set to 'No'

Once you’ve filled in the above fields, scroll to the bottom of the page and click Submit All Changes.

A confirmation page will now show confirming that your settings are being saved.

You will now be returned to the main Voice/Info menu.

Beneath Line 1 Status you should find an option called Registration State. This should now display as Registered. This indicates your VoIP connection has successfully registered and you’re ready to make calls, you can check this by picking-up your connected analogue handset and listening for a dial-tone rather than the beeping/engaged signal previously heard.

Note: If the Registration State does not reflect registered you may need to wait 30 seconds and manually refresh the page. If your Registration State continues to not be Registered you may need to repeat the above configuration steps and ensure you’ve entered the correct VoIP number and VoIP password.

Note: If you require future web-interface access to your ATA, pick-up your connected handset and using the dial pad dial: ****

When you hear the Linksys Configuration menu dial: 210#

You will now be informed the current IP address of the ATA, use this address to access the ATA for additional configuration options.

Alternatives

Tabe line 1: "PROXY AND REGISTRATION"

Proxy: budgetphone.nl use outbound proxy: yes
Outbound Proxy: sip.budgetphone.nl use OB proxy in dialog: no
Register: yes make call without reg: yes
register expires: 60 ans call without reg: yes
use dns serv: no dns serv auto prefix: no
proxy falldack intvl: 3600 proxy redundancy method: normal
voice mail server: <leave empty> mailbox subscribe expires:2147483647

Tab "SUBSCRIBER INFORMATION" (in case of provide budgetphone)

displayname:

Userid: put it like 31xxxxxxxxx

Password: budgetphone password

use auth id: yes

auth id: budgetphone number 31xxxxxxxxx

Another configuration option

"SIP" tab:
Handle VIA received: yes Handle VIA rport: yes
Insert VIA received: yes Insert VIA rport: yes
Substitute VIA Addr: no Send Resp To Src Port: no
STUN Enable: yes STUN Test Enable: no
STUN Server: stun.voipbuster.com

"LINE 1" tabj
NAT Settings
NAT Mapping Enable: yes NAT Keep Alive Enable: yes

proxy and Registration
proxy:sip1.voipbuster.com Use Outbound proxy: no
Outbound proxy: Use OB proxy In Dialog: yes
Register: yes Make Call Without Reg: no
Register Expires:60 Ans Call Without Reg: no
Use DNS SRV: no DNS SRV Auto Prefix: no

 proxy Fallback Intvl:3600 proxy Redundancy Method: Normal

For specific problems, please check our forum or look at the manuals available .