Comparison of VoIP software

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Template:Short description

This is a comparison of voice over IP (VoIP) software that examines applications and systems used for conducting voice and multimedia communications across Internet Protocol (IP) networks. VoIP technology has transformed telecommunications by offering alternatives to traditional telephony systems while providing enhanced features and cost savings.

For residential users, VoIP services typically provide significant cost advantages compared to traditional public switched telephone network (PSTN) services. These systems eliminate geographic restrictions on phone numbers, enabling users to maintain local numbers in any area code regardless of their physical location. For example, a user can operate a New York phone number while residing in Tokyo, facilitating global mobility and reducing international communication costs.

In enterprise environments, VoIP technology enables the consolidation of voice and data networks into a unified IP infrastructure. This consolidation eliminates the need for separate voice and data pipelines while providing advanced capabilities including:

  • Unified communications integration
  • Presence management systems
  • Advanced call routing
  • Mobile device integration
  • Multimedia conferencing capabilities

Softphone applications serve as the primary client-side implementation of VoIP technology. These applications transform standard computing devices into full-featured communication endpoints, supporting voice and video calls over IP networks while providing standard telephony functions. Most softphone clients utilize the Session Initiation Protocol (SIP), an open standard that supports various audio and video codecs. Some systems, like Skype, operate on proprietary protocols but can integrate with SIP-based systems through specialized business telephone system (PBX) software.

The VoIP ecosystem encompasses various specialized applications beyond basic communication endpoints:

Core components

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  • Conferencing servers for large-scale virtual meetings
  • Intercom systems for internal communications
  • Virtual foreign exchange services (FXOs)
  • Hybrid systems supporting both VoIP and PSTN integration

Specialized applications

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  • Interactive Voice Response (IVR) systems
  • Automated dictation platforms
  • Professional call recording solutions
  • Custom hold music and messaging systems

VoIP implementations generally fall into two categories:

  • Web-based solutions that operate through browsers, offering simplified deployment and platform independence
  • Standalone desktop applications that provide enhanced features, superior reliability, and advanced feature sets

Desktop applications

Template:Sort-under

Program Operating systems License Costs Protocols Codecs Encryption Max conference peers Other abilities Latest release
Template:Rh| Blink Linux, macOS, Windows Mixed: free software versions under GNU GPLv3 + shareware versions under gplv3 with exception of including proprietary code macOS version proprietary on App Store, free version limited to sponsored SIP provider; Windows version proprietary; Linux version open source ICE, SIP, MSRP, RFB (VNC), XCAP Opus, speex, G.722, GSM, iLBC, PCMU, PCMA TLS, SRTP and ZRTP on all versions, OTR/SMP on Linux and macOS only[1] No limit IM, file transfer, desktop sharing, multi-party conference, wideband Blink Qt
Template:Rh| Battle.net macOS, Android, iOS, Windows Template:Proprietary Free Template:Unk Template:Unk Template:Unk Template:Unk IM, multi-party conference Template:Unk
Template:Rh| Discord macOS, Android, iOS, Windows, Linux Template:Proprietary Free, Premium "Nitro" Subscription for Additional Features. RTP, UDP, WS, HTTPS Opus TLS 5000 soft limit for voice calls,[2] 25 hard limit for video[3] IM, file sharing, desktop sharing, in-game overlay 10.0.19045; Template:Start date and age
Template:Rh| Eyeball Chat Windows Template:Proprietary Free SIP, STUN, ICE, XMPP Template:Unk Yes 5[4] IM, Conferencing, Voice, Video and SIMPLE based presence Windows 3.2; Template:Start date and age
Template:Rh| FaceTime iOS, macOS Template:Proprietary Free SIP, IETF, Signaling protocol for VoIP, STUN, TURN and ICE| IETF, technologies for traversing firewalls and NAT H.264 Video, AAC-ELD Audio, H.263 and VP8 RTP, SRTP IETF|standards for delivering real-time and encrypted media streams for VoIP. 20 Video, voice, conferencing, with additional tools available as "Services".
Template:Rh| IBM Sametime Linux, macOS, Windows, mobile Template:Proprietary ? SIP-SIMPLE, T.120 H.323 TLS Template:Unk IM, File transfer, Voice, Presence, Server stored contact list, HTTP tunneling, plugins, embeddable in Lotus Notes[5] 8.5.2; Template:Start date and age
Template:Rh| Jami Android, FreeBSD, iOS, iPhone, Linux, Microsoft Windows, OS X[6] Template:Open source Free SIP, RTP, STUN per account, SRV, DHT, P2P Audio: Opus, Speex, G.722, G.711, GSM, VP8, G.729, iLBC. Video: H.264, H.263, VP8, MPEG-4 Voice encryption (SRTP with SDES or ZRTP) and signaling encryption (TLS), multiple realms authentication mechanism No limit Blockchain ID-management, Gnome-KDE client, address book, multiple accounts, unlimited call number, call transfer, call hold-unhold, call recording, multi-way conferencing Template:Latest stable software release/Ring (software)
Template:Rh| Jitsi Linux, macOS, Windows (all java supported). Experimental Android builds are also available.[7] Template:Open source Free SIP-SIMPLE, XMPP-Jingle STUN ICE, TURN SILK, G.722, Speex, Opus, G.711 (PCMU/PCMA), iLBC, GSM, G.729, H.264, H.263, VP8 ZRTP, SRTP, OTR, TLS Template:Unk Text messaging, audio-video telephony, IPv6 (often broken,[8] P2P not supported[9]), call recording, 64-bit Template:Latest stable software release/Jitsi
Template:Rh| Linphone Linux, Windows, macOS, Android, iPhone, BlackBerry Template:Open source Free SIP Speex, Opus, G711, GSM, G.722, VP8 (WebM), H263, MPEG4, Theora and H264 (plugin) TLS, SRTP, ZRTP Template:Unk Video, IM, STUN, IPv6 (disables IPv4 support when enabled), P2P, Secure Encryption, User own Encryption via Provided API https://gitlab.linphone.org/BC/public/linphone-desktop 4.2.5; Template:Start date and age, provides daily snapshots via http://www.linphone.org/snapshots
Template:Rh| Messages macOS Template:Proprietary Free, only macOS and iOS SIP AIM ICQ XMPP H263, H264 Template:Unk Template:Unk Integrated, PBX independent 7.0; Template:Start date and age
Template:Rh| MicroSIP Windows Template:Open source Free SIP, STUN, ICE, SIMPLE Speex, iLBC, GSM, G.711, G.722, G.729, SILK, Linear PCM TLS, SRTP Template:Unk Video, voice, IM and Presence Template:Latest stable software release/MicroSIP
Template:Rh| Movim Any, Progressive web application Template:Open source Free XMPP, STUN, TURN Depending the web-browser TLS 2 IM, microblogging, social-network, OMEMO encryption, screen-sharing, file transfer Template:Wikidata
Template:Rh| Mumble Linux, macOS, iOS, Windows, Android Template:Open source Free ICE CELT, Speex, Opus TLS and OCB-AES128 No limit (limited only by server bandwidth and memory) Chat with (limited) embedded HTML, Automatic Gain Control, very low latency, Access Control Lists for user management, Customizable In-Game Overlay for OpenGL and DirectX, Directional Audio, Plugin Support, Nested Channels, Echo cancellation for headset free use, Global Public Server List, Logitech G15 support, Push-To-Talk and Voice-Activation 1.4.287; Template:Start date and age
Template:Rh| Nymgo Windows, Android, iOS Template:Proprietary Free SIP, RTP and RTCP Template:Unk Yes No limit Address Book integration, Call recording/export, Mute, On Hold, Caller ID definition 4.2.9; Template:Start date and age
Template:Rh| Phoner Windows Template:Proprietary Free SIP, TAPI, CAPI G.711a, G.711u, G.722, G.726, G.729, GSM, iLBC, speex, Opus TLS, SRTP, ZRTP 8 Conferencing, call redirection, call recording Template:Latest stable software release/Phoner
Template:Rh| PhonerLite Windows Template:Proprietary Free SIP G.711a, G.711u, G.722, G.726, G.729, GSM, iLBC, speex, Opus TLS, SRTP, ZRTP 8 Conferencing, call redirection, call recording Template:Latest stable software release/PhonerLite
Template:Rh| Roger Wilco GameSpy Windows Template:Proprietary ? Proprietary ? ? Template:Unk ? Template:Start date and age
Template:Rh| Signal Linux, macOS, Windows, Android, iPhone Template:Open source Free RingRTC (WebRTC over Signal protocol[10]) Opus[10] TLS, Signal Protocol[11] 50[12] Signal also allows users to send text messages, files, voice notes, pictures, GIFs, and video messages over a Wi-Fi or data connection to other Signal users on iOS, Android and a desktop app. The app also supports group messaging, read receipts and typing indicators, both of which can be disabled. Template:Multiple releases
Template:Rh| Skype Linux(with limited functionality),[13] macOS, Windows 2000-XP-Vista-7-Mobile (unsupported), BREW, Windows Phone, Android, iPhone, PSP Template:Proprietary Free Proprietary P2P protocol Template:Efn SILK TLS 25 starting with version 3.6.0.216. 10 with 2.x Conferencing, video, file transfer, voicemail, Skype to phone, phone to Skype, additional P2P extensions (games, whiteboard, etc...); depending on platform. Template:Latest stable software release/Skype
Steam Chat Web, Phones, Desktop Template:Proprietary WebRTC
Template:Rh| TeamSpeak Linux, Windows, macOS, FreeBSD, Android, iOS Template:Proprietary Free Template:Unk CELT, Speex (both until server version 3.5.0), Opus[14] Yes 32 unlicensed, 512 with Non-Profit License (available until September 2018), up to 1024 (Gamer License), 2000 Simultaneous server conferencing with tabs, 3D sound effects, scalable permissions system, firewall friendly file transfers, in-game overlay for DirectX & OpenGL games, global public server list, plugin system 3.5.5; Template:Start date and age
Template:Rh| TeamTalk Linux, Windows, macOS, Android, iOS, Raspbian Template:Proprietary Free Template:Proprietary Opus, Speex, VP8 No 1000 Video, file sharing, desktop sharing, stream media files (MP3, AVI) 5.3.3; Template:Start date and age
Template:Rh| TeamViewer Linux, Windows, macOS, iOS, Android[15] Template:Proprietary Free (personal use only) Template:Unk Template:Unk AES256 Template:Unk Template:Unk Template:Latest stable software release/TeamViewer
Template:Rh| Telephone macOS 10.10.2 Template:Open source Free SIP, STUN, ICE Template:Unk No Template:Unk Address Book integration 1.1.4; Template:Start date and age
Template:Rh| Tuenti Android, iPhone, Windows Phone Template:Proprietary Free WebRTC, SIP, XMPP iLBC, Opus Yes Template:Unk Voice, video, Instant messaging, group chat, photo and video sharing, SMS and MMS, native and social network contacts integration, incoming call/IM push notifications.
Template:Rh| Twinkle Linux Template:Open source Free SIP G.711 A-law μ-law, G.726, GSM, iLBC, Speex narrow wide ultrawide SRTP, ZRTP 3 Conferencing, chat, file transfer, Firefox integration, call redirection, voicemail, support of VoIP-to-Phone services Template:Latest stable software release/Twinkle
Template:Rh| Ventrilo macOS, Windows, iOS, Android Template:Proprietary Free Template:Unk Template:Unk No 8 Conferencing, chat, text-to-speech 3.0.8
Template:Rh| Viber Linux,Template:Efn macOS,Template:Efn Windows,Template:Efn Android, Bada, BlackBerry OS, iOS, Series 40, Symbian, Windows Phone Template:Proprietary ? Template:Unk Template:Unk Yes[16] Template:Unk Varies by platform: Text, picture and video messaging on all, voice calling only on iPhone, Android and Microsoft's Windows Phone Template:Latest stable software release/Viber
Template:Rh| Wire Linux, Windows, macOS, iOS, Android, Web Template:Open source not free ? Audio: Opus

Video: VP8

DTLS, SRTP[17] 10[18] End-to-end encryption by default for everything, instant messaging, video call, video group call, file sharing, GIF sharing, push to talk, edit message, delete message (on both side), timed messages, doodling, identity verification, screen sharing (desktop only) ?
Template:Rh| Yate Client Linux, macOS, Windows Template:Open source Free SIP, IAX, XMPP, H.323 G.711a, G.711u, GSM 06.10, iLBC, Speex, G.723, G.726, G.728, G.729 SRTP, maybe ZRTP? Template:Unk 6.0.0; Template:Start date and age
Template:Rh| Zfone Linux, macOS, Windows Template:Proprietary (with viewable source) Includes time bomb provision SIP, RTP Template:Unk SRTP, ZRTP Template:Unk Beta 2008-09-04 (Linux 0.9.224), (macOS 0.9.246), (Windows 0.9.206)

Template:Notelist

Mobile phones

For mobile VoIP clients:

Program Operating systems License Open source Protocols Codecs Encryption Other abilities Latest release
Jami iOS, Android[19] Template:Open source Yes SIP Video: H264, VP8, MP4V, H263, Audio: Opus 48000 hz, G722 PCMA, PCMU SRTP, SIP over TLS ? Version 202103261733 Template:Start date and age
Line Android, iOS Template:Proprietary No ? ? ? ?
Signal iOS, Android Template:Open source Yes WebRTC[11] Opus[11] TLS, Signal Protocol[11] End-to-end encryption by default for everything. CallKit and location privacy,[20] one-to-one and group messaging, video calling,[20] image/video sharing, timed messages, identity verification, screenshot blocking. Android only: SMS/MMS messaging, doodling,[21] GIF sharing.[22] Android 5.2.3 / 15 September 2023

iOS 6.41.1 / 15 September 2023 Desktop 1.33.4 / 13 September 2023

Sipdroid Android Template:Open source Yes SIP ? ? Uses Wi-Fi, 3G or EDGE 2.7
Tango iOS, Android, Microsoft Windows, macOS, Windows Phone Template:Proprietary, freeware ? ? ? ? VoIP, Wi-Fi out & in, SMS over IP, call-through & call-back, instant messaging, videoconferencing ?
WhatsApp

Android, BlackBerry, iOS, Symbian, Windows Phone

Template:Proprietary, freeware No ? ? ECDH, SRTP[23] VoIP and instant messaging over Wi-Fi or a data connection. Template:Latest stable software release/WhatsApp

Frameworks and libraries

Program Operating systems License Protocols, based on, compatible with Encryption Other abilities Key and target markets Latest release
Telepathy, Farstream Linux, macOS, Windows Template:Open source SIP, XMPP (Jingle), ICE (STUN/TURN), UPnP No Multi-user A/V conferencing, IM, collaborative applications Mobile devices (Maemo, Meego), Linux desktop or embedded spec 0.27.2; Template:Start date and age
OPAL Windows, Linux (including embedded variants), macOS Template:Open source SIP, H.323, IAX2, CAPI, VXML Template:Unk Multi-user A/V conferencing, IM, IVR Softphones, softswitches, telephony application servers 3.14.3; Template:Start date and age
GNU oSIP Linux, Windows, macOS, Android, iPhone, BlackBerry Template:Open source SIP, SDP Template:Unk Multi-user A/V conferencing, IM, IVR Softphones, embedded and mobile devices, telephony application servers 4.1.0; Template:Start date and age

Server software

Name Operating systems License Protocols Encryption Notable features Target markets Latest release
3CX Phone System Windows, Linux Template:Proprietary SIP TLS, SRTP VoIP/VideoOverIP calls and conferencing, voicemail and instant messaging < 50,000 users 18.2; Template:Start date and age
AskoziaPBX Standalone program (Linux-based) Template:Proprietary SIP, H.323, IAX, SCCP No ISDN, voicemail, conferencing, MOH, ACD, IVR, call forwarding, call recording SMEs up to 50 users 5.4; Template:Start date and age
Asterisk PBX Linux, BSD, macOS, Solaris Template:Open source SIP, H.323, IAX, MGCP, VoFR, XMPP, Google Talk, TDM TLS, SRTP VoIP gateway, voicemail, basic accounting (expandable with ODBC-compliant database), billing, conferencing, hot desking, IVR trees with conditional logic, call waiting, automated call distribution Enthusiasts, developers, enterprise users (capacity dependent on server design, scalable across multiple servers) Template:Latest stable software release/Asterisk
Brekeke PBX Linux, Windows Server 2016 and Server 2019 Template:Proprietary SIP TLS, SRTP VoIP/VideoOverIP calls and conferencing, voicemail Hosted service providers, Mid-large enterprise 3.12.2.2; Template:Start date and age
CommuniGate Pro Linux, BSD, macOS, Windows, Solaris, HP-UX, AIX Template:Proprietary SIP, XIMSS, XMPP, WebRTC SSL, TLS, SRTP SIP Registrar/Proxy, Authentication, Diameter, RADIUS, ENUM Mobile network operators, ISPs, SaaS providers 6.2.14; Template:Start date and age
Dial Gate VoIP Softswitch Linux, Windows Template:Proprietary SIP TLS, SRTP Billing server, real-time account and line monitoring, web portal Softswitch users, service providers 4.3; Template:Start date and age
Dial-Office IP-PBX Linux, Windows Template:Proprietary SIP TLS, SRTP Unified communications, conference calls, remote worker support and voicemail Small businesses, Mid-large enterprises 4.1; Template:Start date and age
Elastix Linux Template:Proprietary SIP, IAX, H.323, XMPP TLS, SRTP Unified communication server that also supports chat, mail and fax. Capacity dependent on server design, scalable across multiple servers 5.0.0; Template:Start date and age
FreeSWITCH Linux, BSD, macOS, Solaris, Windows Template:Open source SIP, NAT-PMP, STUN, SIMPLE, XMPP, Google Talk (Jingle), IAX, H.323, MRCP, RSS, Skype TLS, SRTP, ZRTP Recording, Voicemail, Conferencing, RADIUS, ENUM, IM Proxy, Streaming, Media gateway, Soft-PBX, IVR (modular) Large soft-switch users, home PBX users, softphone users Template:Latest stable software release/FreeSWITCH
FreePBX Linux, BSD, Solaris Template:Open source SIP, IAX, H.323, XMPP TLS, SRTP Complete PABX Service, based on Asterisk and PHP 5.6; provides a full replacement for a legacy non-VoIP phone system; under current and active development Scales from Raspberry PI (3 users) to multiple parallel clusters (10K+ simultaneous calls) 14.0; Template:Start date and age
Galene Linux, Unix, Mac OS, Windows Template:Open source WebRTC, WHIP TLS, SRTP Lightweight, efficient, easy to install and to administer Teaching, conferences, meetings 0.96.2; Template:Start date and age
GNU Gatekeeper Linux, FreeBSD, macOS, Windows XP-2000-Vista-7 Template:Open source H.323 H.235 H.460.18 firewall traversal, routing, accounting video conferencing, VoIP carriers large and small 3.7; Template:Start date and age
HERO Hosted PBX Linux, Windows Template:Proprietary SIP TLS, SRTP Unified Communications, billing server, cloud-based management and web interface Mid-large enterprises, VoIP carriers and service providers, telecom operators 4.3; Template:Start date and age
Murmur Linux, BSD, macOS, Windows Template:Open source CELT, Speex, Opus TLS Chat with (limited) embedded HTML, ACLs for user management, Customizable In-Game Overlay, Directional Audio, Plugin Support, Nested Channels Individuals to Small and medium enterprise (25-5000 users) 1.2.17; Template:Start date and age
Kamailio, OpenSIPS (formerly named OpenSER) Linux, BSD, Solaris Template:Open source SIP, XMPP TLS, SRTP SIP registrar-proxy, authentication, Diameter, RADIUS, ENUM, least-cost-routing, many others SIP Service Providers 5.2.8; Template:Start date and age
SIP Express Router (SER) Linux, BSD, Solaris Template:Open source SIP No SIP Registrar/Proxy, Authentication, Diameter, RADIUS, ENUM, many others SIP Service Providers 2.0.0 Ottendorf
sipXecs IP PBX Linux Template:Open source Native SIP call control, XMPP TLS, SRTP Full redundancy (HA), instant messaging, voicemail, user portal, admin GUI, plug & play management including phones and gateways, fully featured Enterprises between 10 and 10,000 users, multi-site 14.04.2; Template:Start date and age
vzRoom Windows Template:Proprietary SIP SSL, TLS, AES Instant messaging-chat, VoIP, video, sharing (desktop, video, file), whiteboard, scheduler, recording Individual to small and medium enterprise (2-1,000 users) 0.8.8.735; Template:Start date and age
Yate BSD, Linux, macOS, Windows Template:Open source SIP, IAX, H.323, ISDN, XMPP (Jabber), Jingle (Google Talk), MGCP, SS7 over IP, Cisco SLT (Signalling Link Transport) (SS7 MTP2 backhaul over IP), SCTP, SCCP, TCAP, MAP CAMEL SSL, TLS, SRTP Voice, video, file transfer, data, H323 to SIP signalling proxy, instant messaging, IVR, PC2Phone and Phone2PC gateway, SCCP — GTT routing between networks, Secure Unified Communications, SIP registrar-proxy, SIP SBC (session border controller), USSD, voicemail, VoIP, VoIP to PSTN gateway, conference server (max 200 voice channels per conference), call centre server, prepaid and postpaid cards Deployed on home servers and large networks with millions of users 6.3; Template:Start date and age

Secure VoIP software

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VoIP software with client-to-client encryption

The following table is an overview of those VoIP clients which (can) provide end-to-end encryption.

Client name Development status Open source client End-to-end authentication[lower-alpha 1] Encryption protocols Forward secrecy Multiple encryption Encrypted group calling Proxy, Tor
ZRTP ECDH DTLS SRTP
FaceTime Active No[24] Yes[25] ? ? ? Yes[25] Yes ? Yes No
Jami Active Yes Yes No ? Yes Yes Yes ? Yes ?
Jitsi[lower-alpha 2] Active Yes Yes[24] Yes No Yes Yes Yes[24] Yes Yes ?
Line[26][27] Active No ? ? ? ? ? ? ? No[26] No
Linphone[lower-alpha 2] Active Yes Yes Yes ? Yes Yes Yes Yes ? No
Signal Active Yes Yes[24] No Yes No Yes Yes[24] Yes Yes Depends[28]
Skype
(opt-in per conversation,
one pair of devices per conversation)[29] 		Abandonware No Yes[30] No No No Yes[31] ? ? No No
Telegram Active Yes Yes[32] No No No No Yes ? No No
Threema Active Partially[lower-alpha 3][33] Yes[34] No Yes[34] Yes[34] Yes[34] Partially[lower-alpha 4][34] Yes No No
Viber[16] Active No ? ? ? ? ? ? ? ? No
WhatsApp Active Partially[lower-alpha 3][35] Yes[35] No Yes[35] No Yes[35] Yes[35] Yes[35] Yes[35] No
Wire Active Yes Yes[36] No ? Yes[17] Yes[17] Yes[37] Yes Yes No
Zfone Abandonware Viewable source[38] Yes Yes Optional[39] ? Yes[40] Yes Yes ? ?

See also

Notes

  1. ↑ End-to-end authentication protects communications from man-in-the-middle attacks by the service provider.
  2. ↑ a b Only if the user has registered with a compatible SIP provider. Some SIP providers do not support certain encryption protocols.
  3. ↑ a b Only the encryption related source code is open.
  4. ↑ Only on the network connection, not on the end-to-end layer.

References

Template:Reflist

Template:Telecommunications

  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ Script error: No such module "citation/CS1".
  3. ↑ Script error: No such module "citation/CS1".
  4. ↑ Template:Usurped. EyeballChat.com.
  5. ↑ "Telephony with Lotus Sametime software". IBM.com. Retrieved 2010-02-16
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Interview with Emil Ivov, Deploy360 blog
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ a b Script error: No such module "citation/CS1".
  11. ↑ a b c d Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ a b Script error: No such module "citation/CS1".
  17. ↑ a b c Script error: No such module "citation/CS1".Template:Dead link
  18. ↑ Script error: No such module "citation/CS1".
  19. ↑ [1] Jami downloads
  20. ↑ a b Script error: No such module "citation/CS1".
  21. ↑ Script error: No such module "citation/CS1".
  22. ↑ Script error: No such module "citation/CS1".
  23. ↑ Script error: No such module "citation/CS1".
  24. ↑ a b c d e Script error: No such module "citation/CS1".
  25. ↑ a b Script error: No such module "citation/CS1".
  26. ↑ a b Script error: No such module "citation/CS1".
  27. ↑ Script error: No such module "citation/CS1".
  28. ↑ Script error: No such module "citation/CS1".
  29. ↑ Script error: No such module "citation/CS1".
  30. ↑ Script error: No such module "citation/CS1".
  31. ↑ Script error: No such module "citation/CS1".
  32. ↑ Script error: No such module "citation/CS1".
  33. ↑ Script error: No such module "citation/CS1".
  34. ↑ a b c d e Script error: No such module "citation/CS1".
  35. ↑ a b c d e f g Script error: No such module "citation/CS1".
  36. ↑ Script error: No such module "citation/CS1".
  37. ↑ Script error: No such module "citation/CS1".
  38. ↑ Script error: No such module "citation/CS1".
  39. ↑ Script error: No such module "citation/CS1".
  40. ↑ Script error: No such module "citation/CS1".
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