VoIP Config
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VoIPbuster / VoIPStunt
Sipura Configuration

On the SIP page (advanced mode):
STUN Server: stun.fwdnet.net:3478
(you can use any STUN server, they are not provider specific.)

On the Line 1 (or 2) page:

VOIPSTUNT CONFIG
Proxy: connectionserver.voipstunt.com
Use Outbound Proxy: no
Outbound Proxy: (leave empty)
Register: yes

Display Name: (your voipstunt username)
User ID: (your voipstunt username)
Password: (your voipstunt password)

VOIPBUSTER CONFIG
Proxy: connectionserver.voipbuster.com
Use Outbound Proxy: no
Outbound Proxy: (leave empty)
Register: yes

Display Name: (your voipbuster username)
User ID: (your voipbuster username)
Password: (your voipbuster password)

That's it... leave all other settings default.

Linksys PAP Configuration
Click Here