User Agents

The list below only includes user agents that are actively maintained and claim to conform to RFC 3261.

Windows

Name SIP features (TLS, TCP, NAPTR, ...) Audio Video Presence License Remarks
ActXPhone   ? -     ActiveX controls
Centile VoicePad   yes -     ActiveX controls
damaka   ? yes basic free download, with fixed server  
eStara softphone     yes - - free trial  
eyeP Media   Narrowband: G.711, iLBC, Speex, GSM, G.726, G.729A; wideband: G.722, G.722.2, Speex H.261, H.263 (including 1998, 2000 versions), H.264 no 30-day evaluation  
Counterpath Eyebeam TCP Narrowband: G.711, iLBC, Speex, GSM, G.723.1, G.726, G.729a, EVRC; Wideband: Speex, L16, DV14, G.722.2 (AMR-WB); RFC 2833 yes H.263, H.263+ purchase formerly known as Xten
Gizmo no yes with service -  
is-phone SRTP/TLS, STUN/NAT, TCP, UDP, VPN G.711u, G.711a, G.721, G.723,G.726 (16/24/32/40), Speex (8/16/32), iLBC, GSM (other codecs on request), QoS Support (diffserv, 802.1p) H.263, H.264, Theora, MPEG4V3 Sametime, Outlook/Live Messenger (others on request) Free trial, commercial license integrated into IBM Lotus Notes/Sametime/Symphony and Microsoft Outlook/Exchange/Live Messenger/Office/Interne Explorer, Audio (16 participants) and Video (4 participants) conferencing (100% software based), OEM versions
Jajah yes no with service - Web plugin, iPhone, ...
Kapanga 3261; 2833; STUN G.711, G.722.1, G.723.1, G.726, G.728, G.729A, AMR, GSM, iLBC, Speex H.263, H.263, H.264   Free download also T.38 fax
QuteCom 3261G.711, Speex -   Open source formerly known as OpenWengo
sipc UDP and TCP G.711, GSM H.261 basic, RPID Licensed via FirstHand supports media streaming, SLP, emergency calling, peer-to-peer  
Xten x-lite UDP and TCP G.711, GSM - -    
Zoiper STUN, UDP only G.711, GSM, iLBC, G.729,speex - - free download fax to come

Linux

Name Audio Video Presence License Remarks
Cornfed - G.711, G.729 (commercial version), RFC 2833 DTMF - - free for personal use Designed to support multiple services: maintains registrations with multiple service providers automatically and simultaneously. Gnome GUI and command line client front-ends.
Ekiga iLBC, GSM-06.10, MS-GSM, G.711-Alaw, G.711-uLaw, G.726, G.721 and Speex H.261 QCIF Video Code open source "support[s] both H.323 and SIP, as well as audio and video. Ekiga was formerly known as GnomeMeeting."
minisip G.711, ? yes - open source supports SRTP, MIKEY

Macintosh

Name Audio Video Presence License Remarks
XMeeting G.711 H.264 (partially), H.263, H.261 - open source STUN
Blink G.722, Speex - SIMPLE presence, MSRP (chat, file sharing, desktop sharing)

Last updated by Henning Schulzrinne