Comparison of open-source Android Voip clients

On the Android platform, the open-source projects of the Voip client include Sipdroid, IMSdroid, CSipSimple, and Linphone. The following compares them:

Link \ Client	Sipdroid	IMSdroid	CSipSimple	Linphone
	Sip	3GPP IMS	Pjsip	Osip
Tool Language	Java (Architecture) C ++ (encoding)	Java (UI) C ++ (architecture, encoding)	Java (UI) C ++ (architecture, encoding)	Java C ++
Audio/Video	Audio/Video (low, medium, and high standards) with ECHO noise sound quality optimization effect general video effect.	Audio/Video (low, medium, and high) sound quality is good (with the ability to eliminate noise and echo), the video effect is good.	Audio/Video (0-10 standard) Sound Quality (with the ability to eliminate noise and echo), good video effect, audio, video frequency acquisition, focus, and other operations.	Audio/Video sound quality is good (with noise elimination and echo elimination functions), and the video effect is good.
Audio/Video decoding Encoder	BV, GSM, speex, PCMU, PCMA, G722H, and silk.	H.263 + H263 + H.263 H264-MP H264-BP Theora MP4V-ES VP8 G.729 G.722 Speex-UWB Speex-WB Speex-NB ILBC gsm pcmu pcma.	H.263, H264, G729, iLBC, speex, and silk ......, The decoder is used as a plug-in.	G722, GSM, arm, ilbc, speex, PCMU, PCMA, G722H, silk, vp8, h264, mpeg4 .......
Stun/Turn Technology	Only Stun is supported.	Supported	Supported	Supported
Encryption technology	TLS Encryption	TLS encryption srtp encryption rtcp Encryption	Support TLS encryption srtp encryption rtcp Encryption
ICE Technology	None	Supported	Supported	Supported
Webrtc Technology	None	Supported	Supported	Supported
Qos Technology	None	Supported	Supported
Instant Messaging (online and SMS)	None	Supported	Supported	Supported
Multiple phone calls	None	Supported	Supported
Advantages and disadvantages	Advantages: lightweight architecture, easy to understand. Disadvantage: single function.	Advantage: it has various VOIP functions and can be used directly. Disadvantage: the database is relatively large.	Advantage: the architecture is clear and various VOIP functions are available. Disadvantage: memory overflow (negligible ).	Advantages: supports various platforms and mature technologies. Disadvantage: I don't know.

How can we choose these four projects? The recommended sequence varies with requirements as follows:

First: CSipsimple

Second: IMSdroid

Last: Sipdroid

I did not study the Linphone project and did not comment on it here.