The table provides feature overview of ten open source SIP clients:
| SIP clients | Jitsi | Blink Lite | microSIP | Sfl phone | QuteCom | Ekiga | Linphone | SIPDroid | csipsimple | Twinkle |
| www | jitsi.org | icanblink.com | microsip.org.ua | sflphone.org | qutecom.org | ekiga.org | linphone.org | sipdroid.org | code.google.com/p/csipsimple | twinklephone.com |
| License | LGPLv3 | GPLv3 | GPL | GPLv3 | GPL | GPL | GPLv2 | GPLv3 | GPL | GPL |
| Release | 1.0-beta1-3689 | 0.2.7 | 1.8.2 | 0.9.13 | 2.2.1 | 3.2.7 | 3.4.3 | 2.3 | 0.2.3 | 1.4.2 |
| Date | 4.10.2011 | 25.5.2011 | 15.10.2011 | 5.4.2011 | 9.5.2011 | 31.5.2010 | 25.3.2011 | 24.6.2011 | 19.6.2011 | 25.2.2009 |
| Operating system | Win, Linux, Mac X | Win, Linux, Mac | Win | Linux | Linux, Mac OS, Win, | Linux, Win | Linux, Win, Mac, Android, WebOS | Android | Android | Linux |
| Multiple accounts | Yes | Yes | No | Yes | Yes | Yes | Yes | No | No | Yes |
| Audio | Yes G722, G728, speex, GSM, iLBC, PCMU, PCMA, DVI4 |
Yes G722, speex, GSM, iLBC, PCMU, PCMA |
Yes Speex, PCMU, PCMA, GSM, iLBC, SILK, G.722 |
Yes G722, speex, GSM, PCMU, PCMA, celt |
Yes iLBC, PCMA, PCMU, G.722, Licensed: AMR, AMR-WB, G.729 |
Yes G722, G728, G726, G721speex, GSM, PCMU, PCMA, celt |
Yes speex, GSM, PCMU, PCMA, G.722 |
Yes G.722HD, PCMU, PCMA, speex, GSM, BV16 |
Yes Speex, PCMU, PCMA, GSM, iLBC, SILK,G.722 |
Yes G726, PCMU, PCMA, GSM, speex |
| Video | Yes H264, H263 |
No | No | No | Yes H.263 |
Yes H264, H263, H261, theora |
Yes H264, H263, H263-1998, MPEG4, theora |
Yes | No | No |
| DNS SRV/NAPTR | Yes | Yes | Yes | No | Yes | Yes | Yes | – | – | Yes |
| SIMPLE | Yes | No | Yes | No | Yes | Yes | Yes | – | Yes | No |
| IM | Page/session mode | – | Page mode | Page mode | Page mode | Page mode | Page mode | – | Page mode | Page mode |
| XCAP | Yes | Yes | No | No | No | No | No | – | – | No |
| TLS | Yes | Yes | Yes | Yes | No | No | Yes | – | Yes | No |
| Media encryption/ Key manag. | SRTP/ZRTP, MIKEY on progress | SRTP | SRTP | SRTP/ZRTP | SRTP/ key exchange over Everbee | No | No | – | SRTP/ZRTP | SRTP |
| NAT | No | ICE | STUN, ICE | STUN | – | STUN | STUN | STUN | STUN, ICE | STUN |
| Communication protocols | SIP, XMPP, AIM/ICQ, MSN, Yahoo! | SIP | SIP | SIP, IAX | SIP, MSN, YIM, AIM, ICQ, XMPP | SIP, H.323 | SIP | SIP | SIP | SIP |
| Transport protocols | TCP, TLS, UDP | TCP, TLS, UDP | TCP, TLS, UDP | UDP, TLS/SSL | UDP | UDP | UDP, TCP, TLS | UDP, TCP | UDP, TCO, TLS | UDP, TCP |
| IPv4/IPv6 | Yes/Yes | Yes/No | Yes/No | Yes/No | Yes/No | Yes/No | Yes/Yes | – | – | Yes/No |
| Voicemail | Yes | Yes | No | Yes | – | No | No | – | – | Yes |
| Other features | desktop sharing, voicemail, call recording,multi party conferencing | File transfer, desktop sharing, voicemail, call recording, multi party conferencing | call recording, multi party conferencing | – | – | – | 3 way conferencing | |||
| Notes | Under win 7 and linux there are no services like presence, chat, IM available | Simple client | Under win 7 observed problems with stability | Under win 7/linux observed problems with stability | Advanced configuration options |