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 July 2011.

Dialing through PSTN

+1 703-376-ECHO (3246) - has options to record/playback audio for quality testing and a DTMF key test to help determine how well DTMF is passed by your device or SIP/PSTN client through the network

Dialing through SIP URI

• Free 411 sip:411@ideasip.com +1-800-FREE411 US free directory assistance

• Microsoft BING 411 sip:18002464411@tollfree.alcazarnetworks.com +1-800-BING-411 US free directory assistance

• Microsoft Tellme sip:8355@ideasip.com (news, sports, weather, directory assistance)

• Comedy Cures Foundation sip:18884242424@tollfree.alcazarnetworks.com (daily joke)

• Mouselike.org (UK) Echo and audio quality tests sip:904@mouselike.org or PSTN:+441483604781 - Allows test / connection from anywhere.

• Telephreak sip:telephreak@voip.telephreak.org - The Telephreak's Free Voicemail/Conference system

• Transcendental Connections sip:*061742926@sipbroker.com (*061-742-926 on SIPbroker)

- User Conferences, Ham Radio & CB Radio network linked, Scanner feeds, Local Pay Phones (free), Dial Up modems, + More!

• Project MF sip:17622600@projectmf.homelinux.com Project MF is a living, working simulation of analog SF/MF signaling just as it was used as the standard in the PSTN until the early 90's,

• VoIP Users Conference sip:200901@login.zipdx.com (only active Fridays at 12pm Eastern)

• UCLA sip:13108254321@ucla.edu (no G.729)

• Intertex auto attendant sip:info@intertex.se

• QXIP Music on Hold sip:9999@qxip.net (Curtesy of QUASARMUSIQ)

• QXIP Streaming sip:9901@qxip.net (Hypemachine RSS Feeds)

• QXIP Streaming sip:9902@qxip.net (Misc. Web Radio)

• QXIP Streaming sip:pirateradio@qxip.net (Pirate Party C.C. Radio Stream

• Simafelagid ehf. Echo test and music on hold sip:4151595@services.sip.is / PSTN: +354 415 1595

• Kansas State University Test Phone Number sip:*01317853950049@ekiga.net

• IdeaSIP echo test sip:301@ideasip.com

• IdeaSIP welcome message sip:201@ideasip.com

• IdeaSIP random messages sip:**12340@ideasip.com (12341-12348 also work)

• iptel.org echo test sip:echo@iptel.org

• iptel.org music test sip:music@iptel.org

• ZipDX sip:wbdemo@conf.zipdx.com Wideband demo (check if you're connecting using G.722)

• Voxalot echo test (USA) sip:*010600@ekiga.net

• Voxalot echo test (Europe) sip:*031600@ekiga.net

• Voxalot echo test (Australia) sip:*061600@ekiga.net

Dialing through ENUM

• ENUM Test +43 720 0101011 This number is reachable only via ENUM+SIP. After connect you will hear the word "ENUM" followed by some music.

• ENUM Test +43 720 0101012 This number is reachable only via ENUM+SIP. You get connected to Asterisk's Echo application.

• ENUM Test +43 720 0101010 This number is reachable via PSTN and ENUM+SIP. If you get connected via ENUM you will hear the word "ENUM" followed by some music. If you connect via PSTN you will only hear some music.

• ENUM Test +43 780 004711 This number is reachable via PSTN and ENUM+SIP. Both variants will be delivered to this Asterisk box via SIP. This test number is to test the reachability of Austrian's new '+43 780' numer range (ENUM based number range). After connect you will hear the word "ENUM" followed by some music.

• ENUM Test +43 780 0047111 This number is reachable via PSTN and ENUM+SIP. Both variants will be delivered to this Asterisk box via SIP. This test number is to test the reachability of Austrian's new '+43 780' numer range (ENUM based number range). You get connected to Asterisk's Echo application. resolves to sip:enum-echo-test@sip.nemox.net

• ENUM Test +43 780 0047112 This number is reachable via PSTN and ENUM+SIP. Both variants will be delivered to this Asterisk box via SIP. This test number is to test the reachability of Austrian's new '+43 780' numer range (ENUM based number range). You get ring-back indication for few seconds, and then you get busy indication (toll-free testing).

• ENUM Test +43 780 0047113 This number is reachable via PSTN and ENUM+SIP. Both variants will be delivered to this Asterisk box via SIP. After pickup, you will hear a constant 1.000 Hz tone. You will hear tone interruptions if the clients's Jitter-Buffer can't handle the Jitter caused by your Internet connectivity.

Notes:
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. Some numbers such as Vonage numbers can only be called for free from other Vonage phones, so Vonage is NOT open to calls from other SIP proxies.

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