Compatible with any SIP- connection, router, telephone system or provider, z.B.:
| 3com | Aastra | Agfeo |
| Alcatel OmniPCX Enterprise (OXE) | Alcatel OXO Connect | Alcatel-Lucent |
| Asterisk | ASTIMAX | Auerswald (FONtevo) COMpact / COMmander |
| autphone aut-voice | Avaya IP Office | Bintec Elmeg be.IP |
| to. cloud | DeTeWe | German telephone standard |
| dus.net | Ericsso | Firstcom Europe AG Universe Cloud Connect |
| FRITZ! Box | HFO Crown Centrex | Innovaphone |
| Innovaphone | Mitel | Mitel MiVoice 400 |
| Mitel MX-ONE | NFON | Ostertag DeTeWe - OD Cloud |
| Panasonic | Panasonic KX-NS (X) series | Placetel (Cisco) |
| Placetel PROFI vPBX | reventix virtual telephone system | Starface telephone systems |
| Swyx | Telekom digitization box Premium | Telekom digitization box Smart |
| Telekom Octopus FX | Telekom Octopus NetPhone Cloud | Tiptel |
| Unify OpenScape 4000 | Unify OpenScape Business | Vodafone |
The IP-SoftPhone offers many preset solutionsto make setup easier :
| 1 and 1 | 3cx- Internet | 3xc-LAN | 3 stars | 3utelecom | annatel | aol |
| asia-call | atpnet | avm | avm-box | babytel | blueface.ie | bluesip |
| bluewin | Boadvoice | BugetPhone | callcantric.com | CallVoip | congstar.de | corbina.ru |
| debitel | deltathree | draytel | dus | easybell | ekiga.net | execulink |
| free.fr | freecall.com | freeipcall | fritz-box | globaliptel | gmx | hive |
| ipphonex | interbit | internetcalls.com | ipertelecom.fr | ippi.fr | iptel | iristel |
| kamp-dsl | kt-net.at | mobilkom austria | openvoip-it | outbox.de | pbx-network | pennytel.com |
| peoplefone | phonext | placetel | plfon.pl | poivy | powder | purtel |
| qsc | source | ring central | rolmail | rynga.com | simplyconnect | singing |
| sipbase | sipbase vTK | sipcall | sipgate | sipgate-team | sipgate.co.uk | sipgate.com (US) |
| sipgate.ru | sipphone | skypho | slovanet | smartnet | snafu | strato |
| t-online | telecass | teleson | phone | Tesco.com | think international | unotel |
| viatalk | viva.gr | vodafone.is | voicetrading | voipax | voipgateway | voipian |
| voipraider.com | voiptalk | vonage | web.de | winet.ch | Xeloq | XS4ALL telephony |
| yesss |