Problem Getting RECOG_INSTANCE() Value When Using MRCPRecog with Asterisk-Java AGI

I am running some operations over Asterisk-Java AGI (Asterisk Gateway Interface) using MRCPRecog. There is a problem I am facing with the results from MRCPRecog.

The result returned by MRCPRecog is as follows:

<result xmlns="http://www.w3.org/2000/xforms">
    <interpretation grammar="4791780161253090829" confidence="99">
        <input mode="speech">edirne</input>
        <instance> Edirne;
        </instance>
    </interpretation>
</result>

Which I try to retreive with this code:

String recogConfidence = channel.getVariable("RECOG_CONFIDENCE()");
String recogInput = channel.getVariable("RECOG_INPUT()");

But recogConfidence is null.

When I print the same value in dialplan with this:

 same => n,Verbose(Instance: ${RECOG_INSTANCE()})

I can see the value properly.

I also tried the following methods:

String recogInstance = channel.getVariable("RECOG_INSTANCE(1/1)")

String recogInstance = channel.getVariable("RECOG_INSTANCE(0/1)")

How can I get this value in my AGI code?

Solution

I would like to share my difficulties and the solution.

While searching for the source of the problem, I couldn't find a direct method to get the recog_instance parameter between Asterisk AGI and unimrcp module with java. In this link unimrcp google group post, they suggested that updating the unimrcp module might be useful. I have not tried this suggestion, but it might be an option for you.

Actually, I could observe both in the logs and with tcpdump that the value was being sent to AGI from Asterisk, but somehow, due to buffer size or some other issue, I could not get the value with channel.getVariable.

I tried several different methods until I found my own solution. Finally, I solved it by following these steps

When running SR with MRCPRecog, set the uer parameter to 1.

channel.exec("MRCPRecog", grammar + "," + "p=tredas-sr&spl=tr-TR&t=" + timeout + "&uer=1");

Get the answer returned by the unimrcp function.

String recogInstance2 = channel.getFullVariable("${RECOG_RESULT}");

After that use getLastReplay() to get the response to the last command sent to Asterisk.

String replyString = channel.getLastReply().getFirstLine();

If there are more lines you can use channel.getLastReply().getLines();

Example RECOG_RESULT:

200 result=1 (%3C%3Fxml%20version%3D%221.0%22%3F%3E%0A%3Cresult%09xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fxforms%22%3E%0A%09%3Cinterpretation%20grammar%3D%221548224983940169419%22%20confidence%3D%2271%22%3E%0A%09%09%3Cinput%20mode%3D%22speech%22%3Egaziosmanpa%C5%9Fa%20mah%3C%2Finput%3E%0A%09%09%3Cinstance%3E%0A%09%09%09Gazi%20Osman%20Pa%C5%9Fa%3B%0A%09%09%3C%2Finstance%3E%0A%09%3C%2Finterpretation%3E%0A%3C%2Fresult%3E%0A)

This piece of code allowed me to get the recog result unencoded by uer. Then, using XML parser, I extracted the values I wanted and successfully solved my problem.

I hope this information is useful for you