IMSDroid is the first fully featured open source SIP/IMS client for android. It's also the only free Android SIP client which supports direct Video Calls.

3GPP IMS (IP Multimedia Subsystem) is the next generation network for delivering IP multimedia services. IMS is standardized by the 3rd Generation Partnership Project (3GPP). IMS services could be used over any type of network, such as 3GPP LTE, GPRS, Wireless LAN, CDMA2000 or fixed line.

The current version of IMSDroid partially implements GSMA Rich Communication Suite release 3 and The One Voice profile V1.0.0 (LTE/4G, also known as GSMA VoLTE) specifications.


  • SIP(RFC 3261, 3GPP TS 24.229 Rel-9)
  • Signaling Compression, SigComp(RFC 3320, 3485, 4077, 4464, 4465, 4896, 5049, 5112 and 1951)
  • Enhanced Address Book (XCAP storage, authorizations, presence, ...)
  • Partial supports for GSMA Rich Communication Suite release 3
  • Partial supports for One Voice Profile V1.0.0 (GSMA VoLTE)
  • Partial supports for MMTel UNI (used by GSMA RCS and GSMA VoLTE)
  • IMS-AKA registration (both AKA-v1 and AKA-v2), Digest MD5, Basic
  • 3GPP Early IMS Security (3GPP TS 33.978)
  • Proxy-CSCF discovery using DNS NAPTR+SRV
  • Private extension headers for 3GPP
  • Service Route discovery
  • Subscription to reg event package (Honoring network initiated (re/de/un)-registration events)
  • 3GPP SMS Over IP (3GPP TS 23.038, 24.040, 24.011, 24.341 and 24.451)
  • Voice Call (AMR-NB, GSM Full-Rate, PCMA, PCMU, Speex-NB, iLBC)
  • Video Call (H264, Theora, H.263, H.263-1998, H.261)
  • DTMF (RFC 4733)
  • QoS negotiation using Preconditions (RFC 3312, 4032 and 5027)
  • SIP Session Timers (RFC 4028)
  • Provisional Response Acknowledgments (PRACK)
  • Communication Hold (3GPP TS 24.610)
  • Message Waiting Indication (3GPP TS 24.606)
  • Calling E.164 numbers by using ENUM protocol (RFC 3761)
  • NAT Traversal using STUN2 (RFC 5389) with possibilities to automatically discover the server by using DNS SRV

External links

Created by: alice27, Last modification: Thu 29 of Jul, 2010 (13:38 UTC)
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