You can call the following VoIP numbers for free. From a softphone, just copy&paste the full SIP address (sip:user@domain.com). From a hardware SIP adapter, copy&paste the full SIP address into your speed dial web page. All of these numbers worked in June 2007.

• Weather in Canberra, Australia sip:+61262223590@aarnet.edu.au
• Weather in Sydney, Australia sip:+61297796990@aarnet.edu.au
• Weather in Brisbane, Australia sip:+61733179590@aarnet.edu.au
• Weather in Perth, Australia sip:+61892880790@aarnet.edu.au
• Weather in Adeliade, Australia sip:+61884614990@aarnet.edu.au
• Weather in Melbourne, Australia sip:+61392118490@aarnet.edu.au
• Echo test sip:613@fwd.pulver.com
• Free Partyline server: On this voice talk conference server you can meet new people 24/24 7/7 ; with iax2 webphone on webpage, but can also be reached with SIP sip:600@sip.wmc-telecom.net
• ENUM echo test: tel:+437800047111 (no G.729; German-language greeting); resolves to sip:enum-echo-test@sip.nemox.net
• FWD Volunteer Welcome Line sip:55555@fwd.pulver.com
• HAM radio tests. echotest IAX2:600@asterisk.hamwlan.net ; 1004 Hz tone 0dBm IAX2:1000@asterisk.hamwlan.net ; my radiochack IAX2:1009@asterisk.hamwlan.net
• Intertex autoattendant sip:autoattendant@intertex.se
• Local weather in Lithuania, Vilnius. iax2: guest@gool.dyndns.biz/615
• Mouselike.org (UK) Echo and audio quality tests sip:904@mouselike.org or PSTN:+441483604781 - Allows test / connection from anywhere.
• Party Line sip:17475552663@proxy01.sipphone.com ( all-VoIP conference call every Saturday at 20:00 GMT )
• Patton Electronics sip:support@patton.com (no G.729) is this working?
• TELL sip:18005558355@proxy01.sipphone.com (news, sports, weather)
• UCLA sip:13108254321@ucla.edu (no G.729)
• Xmission sip:xmission@pbx.xmission.com (no G.729)
• Prato City Hall, Italy - Echo test sip:05741837999@voip.comune.prato.it or iax:guest@voip.comune.prato.it/05741837999
• John Todd's screaming monkeys sip:1234@loligo.com
• http://www.telephreak.org sip:telephreak@voip.telephreak.org - The Telephreak's Free Voicemail/Conference system

Notes:

1. To dial from a hardware SIP adapter, you can usually paste the entire address into your phone's speed dial web page. SIP adapters cannot call any IAX numbers.
2. G.711 is the usual codec that VoIP phones use, but the WiSiP phone works better with G.729-only selected. Calls from a WiSiP phone to VoIP numbers that don't support G.729 will ring and connect, but you won't hear anything after that.
3. Suggest testing from pulver.communicator or StarTel.pt with the X-Lite softphone. Please list only *open* VoIP phone numbers and Free VoIP Networks, meaning that you have successfully made a call to that number from a SIP proxy located in a different domain. For example, you can call sip:xmission@pbx.xmission.com from X-Lite which registered in the StarTel.pt domain, so the xmission SIP number is open. On the other hand, Vonage numbers can only be called for free from other Vonage phones, so Vonage is NOT open to calls from other SIP proxies.
4. If you install SJPhone, it will make SIP a "registered protocol" in Windows, so that clicking on one of the above 'sip:' links will automatically open SJPhone and start the call.
5. http://www.trxtel.com has discontinued free calls to 1-800 numbers, "Due to recent legal activity against some phone companies and other operators on VoIP terminated calls"
6. But SIPBroker has picked up the baton for 18xx numbers. Their code is *1800 etc - search the provider list for "Toll Free Service (N. America)" without the quotes. Thanks SIPBroker

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