171 - Voicemail
3000 - Blueface Mainline
3010 - Blueface Technical Support
5242020 - Check Blueface voicemail
5242025 - Enter extension to call a Blueface VoIP number
5242030 - Calling Card Gateway
5242029 - Blueface go MOBILE Access Number
300 - Crazy Monkeys
301 - Echo Test
302 - TellMe (via FWD and often unavailable during US working hours)
303 - Speaking Clock
304 - Mr Roboto
305 - Music on Hold
306 - DTMF Checker (enter number and it will be read back to you)
307 - Record and Playback (records a 10 second snippet of your audio and plays it back)
*1 or 19301 - Sipgate UK
*1747 or 1931747 - SIP Phone
*2 or 19302 - Free World Dialup
*3 or 19303 - VoipTalk
*4 or 19304 - Stanaphone
*5 or 19305 - Nildram
*768 or 193768 - PlusNet
*8 or 19308 - SIPBroker large number of SIP and ENUM services available, test number.
*8*011188888 - Sip Broker
*8*777 - Sipgate Germany (via SIP Broker)
*9 or 19309 - Draytel