Mobile Telephony API (MTA) 为在J2ME设备中的Java程序使用网络设备以及控制呼叫定义了一系列fuctions，MTA 会很适用于小设备。而现在目前的 JTAPI 和 JAIN JCC 都不是很适用。
官方提到：
"Mobile Telephony API (MTA) defines a set of functions for controlling calls and using network services suitable for Java applications written for J2ME devices. An example of Java application that uses MTA can be conference application, scheduled calls, or voice services. The MTA must be suited to small devices in terms of functionality and processing. Existing APIs such as JTAPI and JAIN JCC do not suit these requirements."
J2me社区：
http://www.matrix.org.cn/topic.shtml?forumId=4
官方网站：
http://jcp.org/aboutJava/communityprocess/pfd/jsr253/
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