FonoSIP.com - Free SIP VoIP Internet Phone Service

Determine the IP Address of your phone
Dial ****
Wait for the "Sipura configuration menu..." message
Dial 110# and note returned IP address
Go to http://ipaddress/admin/advanced, 
where ipaddress your IP address
Select the Line 1 tab

General Settings

User: your_sip_number
Password: your_password
Proxy: fonosip.com

Confirm your Network Settings for Public IP

Use Outbound Proxy No
Outbound Proxy leave blank

Confirm your Network Settings for NAT

NAT Mapping Enable Yes
NAT Keep Alive Enable Yes
Use Outbound Proxy No
Outbound Proxy leave blank
Substitute VIA Addr Yes
STUN Enable No

Confirm your Network Settings for Stun

STUN Enable Yes
STUN Server stun.fonosip.com:3478

Confirm your Network Settings for Outbound Proxy

Use Outbound Proxy No
Outbound Proxy: empty

Troubleshooting

If the phone fails to login, or you have one-way audio please take the time to double check your configuration as above.
If everything appears to be correct, the problem may be your firewall

If your router/firewall suports DMZ, put your hardware phone in the DMZ area

If you have an external firewall try opening SIP ports
SIP signalling ports (UDP) = 5060 - 5061
DNS port (UDP) = 53
TFTP port (UDP) = 69
RTP/RTCP ports (UDP) = 8000 - 8001
RTP/RTCP ports (UDP) = 10000 - 30000

FonoSIP.com. We provide IP PBX Software and VPN secure centrex service. FonoSIP.com supports Xten / Counterpath SIP softphones and Internet telephony equipment such as Sipura 2000, Sipura 3000, Cisco 186, Linksys PAP2, RT31P2, WIP300. D-Link DVG-1402SL, UTstarcom F3000. Nokia E60 E61i N70 95. Symbian OS. Windows Mobile 6. Apple iPhone, T-Mobile Dash. Fring. We also support Asterisk PBX, TrixBox and offer VoIP PBX software for businesses, resellers, ITSPs and campus applications. Unified Communications.