UniMRCP-Asterisk and Activating Multiple Grammars

[Stephen Keller]

Having a bit of a problem getting two grammars active at the same time with Asterisk.

I'm attempting to use the Asterisk interface with res_speech_unimrcp.so and my dialplan looks like:

exten => s,n,SpeechLoadGrammar(grammar1,/etc/asterisk/grammar1)
exten => s,n,SpeechLoadGrammar(grammar2,/etc/asterisk/grammar2)
exten => s,n,SpeechActivateGrammar(grammar1)
exten => s,n,SpeechActivateGrammar(grammar2)
exten => s,n,SpeechBackground(beep)

If I look at the MRCP traffic, I see something like this:

MRCP/2.0 3630 DEFINE-GRAMMAR 2
Channel-Identifier: 05ed7ced-31b9-4cea-8@speechrecog
Content-Type: application/srgs+xml
Content-Id: grammar1
Content-Length: 3467

grammar

And my MRCP server returns a 200 OK, and then I get the second DEFINE-GRAMMAR with the Content-Id set to grammar2. Perfect so far.

But then:

MRCP/2.0 192 RECOGNIZE 4
Channel-Identifier: 05ed7ced-31b9-4cea-8@speechrecog
Content-Type: text/uri-list
Cancel-If-Queue: false
Start-Input-Timers: true
Content-Length: 11

session:grammar2

And obviously I'm missing a reference to session:grammar1 in the RECOGNIZE. It seems to always send just the last grammar I loaded/activated. Is there anyway to have multiple grammars active as part of the same RECOGNIZE request with UniMRCP-Asterisk?

[Arsen Chaloyan]

Actually, it should be possible to load and activate multiple grammars
with Asterisk the way you attempted. I've just tried the same sequence
of dialplan commands, and everything works as expected. In the
RECOGNIZE, both grammars are referenced as follows:

MRCP/2.0 195 RECOGNIZE 4
Channel-Identifier: 5@speechrecog

Content-Type: text/uri-list
Cancel-If-Queue: false
Start-Input-Timers: true

Content-Length: 33

session:grammar1
session:grammar2

First, make sure both grammars are successfully loaded and activated.
If the problem persists, I'd suggest to check the source code and add
debug statements, if needed.

http://code.google.com/p/unimrcp/source/browse/solutions/asterisk-unimrcp/res-speech-unimrcp/res_speech_unimrcp.c#574

Follow uni_speech->active_grammars

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--
Arsen Chaloyan
Author of UniMRCP
http://www.unimrcp.org

[Stephen Keller]

Hi Arsen,

I am not getting that behavior at all. My RECOGNIZE contains only a single grammar reference.

Which version of Asterisk/unimrcp did you test against?

[Arsen Chaloyan]

Hi Stephen,

I was testing it against UniMRCP r1848 and Asterisk 1.8.2.3.

Now, looking back at the change log of res_speech_unimrcp.c,

http://code.google.com/p/unimrcp/source/list?path=/solutions/asterisk-unimrcp/res-speech-unimrcp/res_speech_unimrcp.c&start=1807

I've noticed the relevant modification

http://code.google.com/p/unimrcp/source/detail?r=1796&path=/solutions/asterisk-unimrcp/res-speech-unimrcp/res_speech_unimrcp.c

which is not included into the released UniMRCP/Asterisk package.

So, make sure you're using r1796 or above.

> https://groups.google.com/d/msg/unimrcp/-/hMTiC-F2SNQJ.