Sipdroid 简要评估

1.音频格式:

  G722 HD Voice (64kbit) - only over WLAN and 3G (requires paid account)

  PCMA (64kbit) - only over WLAN and 3G

  PCMU (64kbit) - only over WLAN and 3G

  speex (11kbit) - always try

  GSM (13kbit) - always try

  BV16 (16kbit) - always try

  从源码来看是有g711的.但是没有g729.

2.增益: 耳机,麦克风,Headset

3.Video Quality : High 352x288@360kbit

               Low 176x144@192kbit

Sipdroid目前支持基本的呼叫功能. 特殊的PBX功能需要服务器配置提供. 

The following features are provided by the Free Account on pbxes.org:

    * Change number format (e.g. convert the + codes)

    * Music on hold

    * Support of several modes for DTMF tones

    * Support for NAT (network address translation)

    * Simultaneous Outbound Calling

    * Screening anonymous callers 

    * Time-based routing for incoming calls

    * Attended Call Transfer

    * Conferences

    * Video Reception (Video Transmission is supported by Sipdroid natively)

    * Trigger callback or callthru (if no suitable data network available)

* Calls to Skype users 

不足:

使用环境要求无线WLAN,3G,EDGE(2.75G).

Elastix(Asterisk)上面能够实现Ekia/X-lite与Sipdroid的视频电话互通,但也存在问题,比如不能接到从其他Client呼入的视频电话(原因是Sipdroid 在answer视频呼叫的时候SDP会省略Video codec) 

对服务器的依赖性很大, 很多未解决的issues都显示出这一点. 虽然有人提出可以通过在服务器上配置来处理Sipdroid发送的这种非标准的RTSP，但是也局限于Sipdroid to Sipdroid.