SDF VoIP Extension Directory SDF's C*NET NXX is 333 (ex. +1-333-1000 connects you with our Milliwatt) For listings that have enabled 'Direct VoIP' dial extension (@) sip.sdf.org Please note that making unsolicited calls may be considered rude Test and Service Extensions Extension Subscriber Description 24/7 1001 internal Date and Time UTC YES 1002 internal Linear Sine Test from 16Hz to 20kHz YES 1003 internal Exponential Sine Test from 16Hz to 20kHz YES 1004 internal Milliwatt (1004Hz @ 0dB) YES 1005 internal Echo Response Test (USA) YES 1006 internal CQ Serenade YES 1009 internal IVR Adventure Game YES 1026 internal 2600Hz @ 0dB YES 1030 internal Music on Hold YES 1085 internal Voice Mail System YES 1086 internal Conference Bridge (no mute) YES 1088 internal Conference Bridge (Press #1 to toggle mute) YES 1929 internal C*NET Gateway YES 5004 internal Milliwatt (1004Hz @ 0dB) (EU) YES 5005 internal Echo Response Test (EU) YES 5085 internal Voice Mail System (EU) YES 5088 internal Conference Bridge (EU) (Press #1 to toggle mute) YES Subscriber Extension Directory Extension UTC +/- Offset Subscriber Description Unsolicited Calls Direct VoIP 1100 -08:00 smj Nokia e70 S60 YES YES 1022 -07:00 developer Blink YES 1057 -06:00 jebug29 X-Lite for Windows YES YES 1058 -05:00 adamd Linphone on Linux YES YES 1066 -07:00 shufei Blink, Linphone YES YES 1084 -04:00 benharri builtin android client YES YES 1087 -04:00 moondoggy Linphone YES YES 1101 -07:00 br Nokia N900, Ekiga YES 1103 +00:00 yargo linphone, Twinkle, etc YES 1106 -06:00 ecelis csipsimple, ekiga YES 1107 -05:00 nsweeney iPhone YES 1111 -08:00 testing testing NO 1112 -08:00 anthonyg Nexus S, Linphone YES YES 1116 +05:30 rmj Blink YES 1118 +01:00 vosi various clients YES 1119 -05:00 carbine Aastra 9133i YES 1120 -05:00 bb Asterisk 1.6 YES 1121 +00:00 jones Various Clients YES 1127 -08:00 alancf Various Clients YES 1130 -07:00 ajgraves Linphone YES 1131 -06:00 wa5pb Ekiga YES 1132 -05:00 tg s60 / Blink YES 1133 -07:00 samos Droid YES 1134 -05:00 slugmax Grandstream GXP2000 YES 1139 -05:00 xcitor Blink SIP Client, HT-502 ATA YES YES 1140 +01:00 wyan iPad, Nexus One YES 1141 -08:00 dhaber YES 1144 +00:00 phm linphone YES 1145 -06:00 xexyz Linphone YES 1146 +11:00 thomask Nokia E63 YES 1151 -06:00 jecxjo Zoiper YES YES 1155 -09:00 ta2 linphone on iPhone YES YES 1159 -06:00 zeptar Blink YES 1165 -04:00 amrowsell Pixel 2 XL, Jami on Linux YES YES 1166 -05:00 grobe0ba Bria on iOS/CSipSimple on Android, via FreeSwitch PBX YES 1169 -06:00 sirmxe Various YES 1174 +00:00 nb0yjxtr Ekiga YES 1177 -06:00 kdavis GS-DP715 YES YES 1192 -07:00 nblade CSipSimple on Android YES YES 1225 -05:00 bac Aastra 9133i YES 1270 -08:00 niro CSipSimple YES YES 1291 +08:00 yupeng speedtouch st780wl YES YES 1313 +00:00 nicknick Grandstream GXP2100 YES YES 1343 +02:00 tisho Linphone on Android YES YES 1359 +12:00 thom Ekiga YES YES 1366 -07:00 dbk Nokia N900 & softphone(s) YES YES 1380 -05:00 thegiant PBXes hosted PBX YES YES 1388 +00:00 irl Asterisk (using FreePBX) YES YES 1399 -08:00 vandys Asterisk YES YES 1423 -08:00 ladams Cisco 7960G YES YES 1460 -08:00 weevie Grandstream Handytone 286, Jitsi, Blink YES YES 1483 -08:00 quintin Obihai OBi1062 YES YES 1504 -06:00 overland Pirelli DP-L10 YES 1517 -05:00 epl692 Grandstream HT503 YES YES 1542 -05:00 handyc Linphone YES YES 1572 -05:00 hobbsc Grandstream DP250/270, Linphone, Cortelco 2500 via Grandstream HT801 YES YES 1584 -05:00 ki Nexus 5, VDV23 YES YES 1605 +01:00 beni This on a FritzBox YES YES 1617 -05:00 webwiz Various YES YES 1632 +00:00 hugh.mayfield Various clients on GNU/Linux and Replicant YES YES 1662 -07:00 slunky Blink, Bria, Hacked VDV23 YES YES 1679 -04:00 michaeldavis Cisco 303 YES 1688 -06:00 dbvelez Linphone iPhone 5s YES 1692 -08:00 nydel blink, Linphone iPhone4s YES YES 1696 -08:00 edgchacon Various YES 1739 -06:00 jasmaz Grandstream HT286 YES 1770 -04:00 cel baresip, Linphone YES YES 1794 -06:00 jwh Linphone YES YES 1795 -08:00 wireddude Linphone YES 1797 -04:00 snowdusk Telephone for Mac OS X, Linphone for iOS YES YES 1799 -04:00 robmusial Various for Linux, *BSD, macOS YES YES 1877 -08:00 nonlinear Various YES YES 1897 -05:00 tomasino Google Pixel, native Android client YES YES 1908 -06:00 mnw Linphone on macOS X YES YES 1913 -05:00 zelbrium Telephone on Mac YES 1917 -08:00 dokuja OBi110 YES YES 1999 +10:00 cat Cisco SPA112 and various Australian phones