Subject: Re: [Speechsc] query regarding multiple resources in a MRCP clientsession

From: sreekanth <[email-masked]>
Date: Wed, 16 Aug 2006 16:51:45 +0530

Hi klaus,

      As per the MRCPv2 spec , it is not possible to have two Recognition resources in a single MRCP Session.

"For implementations where a single recognition resource does not support both modes, or simultaneous normal and hotword recognition is desired, the two modes can be invoked through separate resources allocated to the same SIP dialog (with different MRCP session identifiers) and share the RTP audio feed."

    I have one more query regarding the channel Identifier header. Suppose if  a ASR and  a TTS are part of one SIP dialog, then the channel identifiers for these control channels should have the same intial unambiguous string part. But the following example of the specification contradicts to this understanding
The sample from draft 10 (page 168) is:

S->C:

SIP/2.0 200 OK

To:MediaServer <sip:[email-masked]>

From:sarvi <sip:[email-masked]>;tag=1928301774

Call-ID:a84b4c76e66710

CSeq:314163 INVITE

Contact:<sip:[email-masked]>

Content-Type:application/sdp

Content-Length:131

v=0

o=sarvi 2890844526 2890842809 IN IP4 126.16.64.4

s=SDP Seminar

i=A session for processing media

c=IN IP4 224.2.17.12/127

m=application 32416 TCP/MRCPv2

a=channel:32AECB23433801@speechsynth

a=cmid:1

m=audio 48260 RTP/AVP 0

a=rtpmap:0 pcmu/8000

a=sendonly

a=mid:1

m=application 32416 TCP/MRCPv2

a=channel:32AECB23433802@speechrecog

a=cmid:2

m=audio 48260 RTP/AVP 0

a=rtpmap:0 pcmu/8000

a=rtpmap:96 telephone-event/8000

a=fmtp:96 0-15

a=recvonly

a=mid:2

Any clarifications on this will be highly appreciated.

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  ----- Original Message ----- 
  From: Reifenrath, Klaus, VF-Group 
  To: sreekanth ; [email-masked] 
  Cc: [email-masked] 
  Sent: Monday, June 26, 2006 1:22 PM
  Subject: RE: [Speechsc] query regarding multiple resources in a MRCP clientsession

  Hi Sreekanth,

  yes there are use-cases for that, e.g. to run a hotword recognition session in parallel with a "normal" recognition session. 

  Regards,
  Klaus  

----------------------------------------------------------------------------
    From: sreekanth [mailto:[email-masked]] 
    Sent: Montag, 26. Juni 2006 07:30
    To: [email-masked]
    Cc: [email-masked]
    Subject: [Speechsc] query regarding multiple resources in a MRCP clientsession

    Hi,

    Is there any use case in having two resouces of the same type(eg: two TTS) in a single MRCP session????

    Regards,
    Sreekanth
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