IMSDroid 是 Android 上的一个高质量的视频 SIP/IMS 客户端。值得关注的特性：

• SIP(RFC 3261, 3GPP TS 24.229 Rel-9)

• TCP and UDP over IPv4 or IPv6

• Signaling Compression, SigComp(RFC 3320, 3485, 4077, 4464, 4465, 4896, 5049, 5112 and 1951)

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• 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)

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• 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)

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• 3GPP SMS Over IP (3GPP TS 23.038, 24.040, 24.011, 24.341 and 24.451)

• Voice Call (G729AB1, AMR-NB, iLBC, GSM, PCMA, PCMU, Speex-NB)

• Video Call (VP8, H264, MP4V-ES, 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 (TURN already implemented and ICE is under tests)

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