开源SIP Android客户端：IMSDroid
IMSDroid 是 Android 平台上的一个高质量的开源视频 SIP/IMS 客户端。亮点：
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SIP(RFC 3261, 3GPP TS 24.229 Rel-9)
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TCP and UDP over IPv4 or IPv6
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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, ...)
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Partial supports for GSMA Rich Communication Suite release 3
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Partial supports for One Voice Profile V1.0.0 (GSMA VoLTE)
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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
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3GPP Early IMS Security (3GPP TS 33.978)
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Proxy-CSCF discovery using DNS NAPTR+SRV
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Private extension headers for 3GPP
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Service Route discovery
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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)
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Voice Call (G729AB1, AMR-NB, iLBC, GSM, PCMA, PCMU, Speex-NB)
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Video Call (VP8, H264, MP4V-ES, Theora, H.263, H.263-1998, H.261)
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DTMF (RFC 4733)
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QoS negotiation using Preconditions (RFC 3312, 4032 and 5027)
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SIP Session Timers (RFC 4028)
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Provisional Response Acknowledgments (PRACK)
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Communication Hold (3GPP TS 24.610)
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Message Waiting Indication (3GPP TS 24.606)
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Calling E.164 numbers by using ENUM protocol (RFC 3761)
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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)
