Possible values for codecs in mrcp.conf

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Jatin Parekh

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Nov 27, 2019, 8:28:17 AM11/27/19
to UniMRCP
Hey everyone,
I've been going through sample Demo Recog plugin and trying to connect it to my own ASR service. The plugin requires PCM data at 16000Hz.

While going through the Asterisk/UniMRCP Integration document, there is a field called codecs with description "Specifies the RTP supported codecs."
Can someone explain what could be the possible values for this field?

I need to know this as I am stuck at a step where I keep receiving the error in my UniMRCP Server logs when I load my plugin.
2019-11-27 13:19:50:347005 [WARN]   Reject RTP Session *.*.*.*:5124 no codecs matched

I've been able to integrate Azure SR plugin with Asterisk/UniMRCP as per the docs and that works correctly. 
For my own plugin, I've tried using the 16000Hz specific codecs.
PCMU/97/16000 PCMA/98/16000 L16/99/16000 in mrcp.conf as well unimrcpserver.xml. 
However, I still keep getting the above error when starting the UniMRCP server.

Or if there is anything else that I would need to change in Asterisk or UniMRCP config to be able to send data at 16000Hz, please do let me know.

Thank you,

Arsen Chaloyan

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Nov 27, 2019, 10:27:00 PM11/27/19
to UniMRCP
Hi Jatin,

Both sides should advertise 16 kHz codecs in order for offer/answer to complete successfully. I cannot tell what your the exact problem is without the logs.

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

Jatin Parekh

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Nov 28, 2019, 6:44:51 AM11/28/19
to UniMRCP
Hey Arsen,
Here are the settings that I have configured:

In /etc/asterisk/mrcp.conf
codecs = PCMU/97/16000 PCMA/98/16000 L16/99/16000 telephone-event/102/16000

In unimrcpserver.xml,
<codecs own-preference="false">PCMU/97/16000 PCMA/98/16000 L16/99/16000 telephone-event/102/16000  </codecs>

In my Plugin (which is a clone of Demo Recog for now), I am adding option only for 16kHz sampling rate.
mpf_codec_capabilities_add(
&capabilities->codecs,
MPF_SAMPLE_RATE_16000,
"LPCM");

With all of the above configuration, here are the logs:

Logs from Asterisk:
    -- Goto (res-speech-unimrcp-10,s,1)
    -- Executing [s@res-speech-unimrcp-10:1] Answer("PJSIP/6001-00000000", "") in new stack
       > 0x7fed60025fd0 -- Strict RTP learning after remote address set to: 27.106.23.242:8000
       > 0x7fed60025fd0 -- Strict RTP switching to RTP target address 27.106.23.242:8000 as source
    -- Executing [s@res-speech-unimrcp-10:2] MRCPRecog("PJSIP/6001-00000000", ""builtin:speech/transcribe", spl=en-US&f=beep&p=uni2") in new stack
[Nov 28 10:48:15] NOTICE[116114][C-00000001]: app_mrcprecog.c:1070 app_recog_exec: MRCPRecog() grammar: builtin:speech/transcribe
[Nov 28 10:48:15] NOTICE[116114][C-00000001]: app_mrcprecog.c:1085 app_recog_exec: MRCPRecog() options: spl=en-US&f=beep&p=uni2
[Nov 28 10:48:15] NOTICE[116114][C-00000001]: src/mrcp_application.c:117  Create MRCP Handle 0x7fed6003c888 [uni2]
[Nov 28 10:48:15] NOTICE[116114][C-00000001]: src/mrcp_client_session.c:131  Create Channel ASR-0 <new>
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_client_session.c:385  Receive App Request ASR-0 <new> [2]
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_client.c:696  Add MRCP Handle ASR-0 <new>
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_client_session.c:717  Add Control Channel ASR-0 <new@speechrecog>
[Nov 28 10:48:15] WARNING[116010]: src/mpf_rtp_stream.c:232  Failed to Match Codec List 10.6.0.16:28000
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_client_session.c:409  Send Offer ASR-0 <new> [c:1 a:1 v:0] to 10.6.0.16:8060
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_sofiasip_client_agent.c:301  Local SDP ASR-0 <new>
v=0
o=Asterisk 0 0 IN IP4 10.6.0.16
s=-
c=IN IP4 10.6.0.16
t=0 0
m=application 9 TCP/MRCPv2 1
a=setup:active
a=connection:new
a=resource:speechrecog
a=cmid:1
m=audio 0 RTP/AVP 19
a=mid:1


[Nov 28 10:48:15] NOTICE[116011]: src/mrcp_sofiasip_client_agent.c:561  Receive SIP Event [nua_i_state] Status 0 INVITE sent [uni2]
[Nov 28 10:48:15] NOTICE[116011]: src/mrcp_sofiasip_client_agent.c:499  SIP Call State ASR-0 [calling]
[Nov 28 10:48:15] NOTICE[116011]: src/mrcp_sofiasip_client_agent.c:561  Receive SIP Event [nua_r_invite] Status 200 OK [uni2]
[Nov 28 10:48:15] NOTICE[116011]: src/mrcp_sofiasip_client_agent.c:561  Receive SIP Event [nua_i_state] Status 200 OK [uni2]
[Nov 28 10:48:15] NOTICE[116011]: src/mrcp_sofiasip_client_agent.c:499  SIP Call State ASR-0 [ready]
[Nov 28 10:48:15] NOTICE[116011]: src/mrcp_sofiasip_client_agent.c:385  Remote SDP ASR-0 <new>
v=0
o=UniMRCPServer 2746640661893609616 6635347090603250725 IN IP4 10.6.0.16
s=-
c=IN IP4 10.6.0.16
t=0 0
m=application 1544 TCP/MRCPv2 1
a=setup:passive
a=connection:new
a=channel:6cfecdebf05644ce@speechrecog
a=cmid:1
m=audio 0 RTP/AVP 19


[Nov 28 10:48:15] NOTICE[116011]: src/mrcp_sofiasip_client_agent.c:561  Receive SIP Event [nua_i_active] Status 200 Call active [uni2]
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_client_session.c:149  Receive Answer ASR-0 <new> [c:1 a:1 v:0] Status 200
[Nov 28 10:48:15] NOTICE[116009]: src/mrcp_client_connection.c:336  Established TCP/MRCPv2 Connection 10.6.0.16:50904 <-> 10.6.0.16:1544
[Nov 28 10:48:15] NOTICE[116009]: src/mrcp_client_connection.c:433  Add Control Channel <6cfecdebf05644ce@speechrecog> 10.6.0.16:50904 <-> 10.6.0.16:1544 [1]
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_client_session.c:453  Raise App Response ASR-0 <6cfecdebf05644ce> [2] SUCCESS [0]
[Nov 28 10:48:15] ERROR[116008]: app_mrcprecog.c:249 speech_on_channel_add: (ASR-0) Unable to determine codec descriptor
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_client_session.c:385  Receive App Request ASR-0 <6cfecdebf05644ce> [1]
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_client_session.c:828  Terminate Session ASR-0 <6cfecdebf05644ce>
[Nov 28 10:48:15] NOTICE[116009]: src/mrcp_client_connection.c:457  Remove Control Channel <6cfecdebf05644ce@speechrecog> [0]
[Nov 28 10:48:15] NOTICE[116009]: src/mrcp_client_connection.c:384  Close TCP/MRCPv2 Connection 10.6.0.16:50904 <-> 10.6.0.16:1544
[Nov 28 10:48:15] NOTICE[116011]: src/mrcp_sofiasip_client_agent.c:561  Receive SIP Event [nua_r_bye] Status 200 OK [uni2]
[Nov 28 10:48:15] NOTICE[116011]: src/mrcp_sofiasip_client_agent.c:561  Receive SIP Event [nua_i_state] Status 200 to BYE [uni2]
[Nov 28 10:48:15] NOTICE[116011]: src/mrcp_sofiasip_client_agent.c:499  SIP Call State ASR-0 [terminated]
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_client_session.c:207  Session Terminated ASR-0 <6cfecdebf05644ce>
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_client_connection.c:233  Destroy TCP/MRCPv2 Connection 10.6.0.16:50904 <-> 10.6.0.16:1544
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_client.c:706  Remove MRCP Handle ASR-0 <6cfecdebf05644ce>
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_client_session.c:453  Raise App Response ASR-0 <6cfecdebf05644ce> [1] SUCCESS [0]
[Nov 28 10:48:15] NOTICE[116008]: src/mrcp_application.c:203  Destroy MRCP Handle ASR-0
[Nov 28 10:48:15] NOTICE[116114][C-00000001]: app_mrcprecog.c:1034 mrcprecog_exit: MRCPRecog() exiting status: ERROR on PJSIP/6001-00000000
    -- Executing [s@res-speech-unimrcp-10:3] Goto("PJSIP/6001-00000000", "mrcprecog-output,s,1") in new stack
    -- Goto (mrcprecog-output,s,1)
    -- Executing [s@mrcprecog-output:1] Verbose("PJSIP/6001-00000000", "1, status: ERROR, completion-cause: , result: ") in new stack
  status: ERROR, completion-cause: , result:
    -- Executing [s@mrcprecog-output:2] GotoIf("PJSIP/6001-00000000", "0?3:5") in new stack
    -- Goto (mrcprecog-output,s,5)
    -- Executing [s@mrcprecog-output:5] Hangup("PJSIP/6001-00000000", "") in new stack
  == Spawn extension (mrcprecog-output, s, 5) exited non-zero on 'PJSIP/6001-00000000'


Logs from UniMRCP Server:
>2019-11-28 11:41:36:365978 [INFO]   Receive SIP Event [nua_i_invite] Status 100 Trying [SIP-Agent-1]
2019-11-28 11:41:36:366012 [INFO]   Receive SIP Event [nua_i_state] Status 100 Trying [SIP-Agent-1]
2019-11-28 11:41:36:366025 [NOTICE] SIP Call State  [received]
2019-11-28 11:41:36:366054 [INFO]   Create Session 0x7f01a8001a08 <new> [uni2]
2019-11-28 11:41:36:366069 [INFO]   Remote SDP 0x7f01a8001a08 <new>
v=0
o=Asterisk 6623178652956422755 4845956991185761689 IN IP4 10.6.0.16
s=-
c=IN IP4 10.6.0.16
t=0 0
m=application 9 TCP/MRCPv2 1
a=setup:active
a=connection:new
a=resource:speechrecog
a=cmid:1
m=audio 0 RTP/AVP 19
a=mid:1

2019-11-28 11:41:36:366106 [DEBUG]  Signal Message to [MRCP Server] [0x7f01a80040e0;1;0]
2019-11-28 11:41:36:366128 [DEBUG]  Process Message [MRCP Server] [0x7f01a80040e0;1;0]
2019-11-28 11:41:36:366135 [DEBUG]  Dispatch Signaling Message [0]
2019-11-28 11:41:36:366182 [NOTICE] Add Session <233f0cec20554ef0>
2019-11-28 11:41:36:366194 [INFO]   Receive Offer 0x7f01a8001a08 <233f0cec20554ef0> [c:1 a:1 v:0]
2019-11-28 11:41:36:366206 [INFO]   Found MRCP Engine [Demo-Recog-1] for Resource [speechrecog] 0x7f01a8001a08 <233f0cec20554ef0>
2019-11-28 11:41:36:366220 [DEBUG]  Add Control Channel 0x7f01a8001a08 <233f0cec20554ef0@speechrecog> [0]
2019-11-28 11:41:36:366229 [DEBUG]  Signal Message to [MRCPv2-Agent-1] [0x7f01b000b060;1;0]
2019-11-28 11:41:36:366243 [DEBUG]  Add Media Termination 0x7f01a8001a08 <233f0cec20554ef0@rtp-tm> [0]
2019-11-28 11:41:36:366252 [DEBUG]  Signal Message to [Media-Engine-1] [0x7f01b000af40;1;0]
2019-11-28 11:41:36:366259 [DEBUG]  Wait for Messages [MRCP Server]
2019-11-28 11:41:36:366261 [DEBUG]  Process Poller Wakeup [MRCPv2-Agent-1]
2019-11-28 11:41:36:366270 [DEBUG]  Process Message [MRCPv2-Agent-1] [0x7f01b000b060;1;0]
2019-11-28 11:41:36:366276 [INFO]   Add Pending Control Channel <233f0cec20554ef0@speechrecog> [1]
2019-11-28 11:41:36:366285 [DEBUG]  Signal Message to [MRCP Server] [0x7f019c0008c0;2;0]
2019-11-28 11:41:36:366311 [DEBUG]  Wait for Messages [MRCPv2-Agent-1]
2019-11-28 11:41:36:366325 [DEBUG]  Process Message [MRCP Server] [0x7f019c0008c0;2;0]
2019-11-28 11:41:36:366334 [DEBUG]  Control Channel Modified 0x7f01a8001a08 <233f0cec20554ef0@speechrecog>
2019-11-28 11:41:36:366346 [DEBUG]  Wait for Messages [MRCP Server]
2019-11-28 11:41:36:371290 [DEBUG]  Process Message [Media-Engine-1] [0x7f01b000af40;1;0]
2019-11-28 11:41:36:371363 [DEBUG]  Signal Message to [MRCP Server] [0x7f01940008c0;4;0]
2019-11-28 11:41:36:371388 [DEBUG]  Process Message [MRCP Server] [0x7f01940008c0;4;0]
2019-11-28 11:41:36:371396 [DEBUG]  Media Termination Modified 0x7f01a8001a08 <233f0cec20554ef0@media-tm>
2019-11-28 11:41:36:371400 [DEBUG]  Media Termination Modified 0x7f01a8001a08 <233f0cec20554ef0@rtp-tm>
2019-11-28 11:41:36:371404 [WARN]   >>>>>>>>>>>>>>>>> demo_recog_msg_signal
2019-11-28 11:41:36:371408 [DEBUG]  Signal Message to [Demo Recog Engine] [0x7f01b0002a00;1;0]
2019-11-28 11:41:36:371418 [DEBUG]  Wait for Messages [MRCP Server]
2019-11-28 11:41:36:371443 [DEBUG]  Process Message [Demo Recog Engine] [0x7f01b0002a00;1;0]
2019-11-28 11:41:36:371447 [WARN]   >>>>>>>>>>>>>>>>> demo_recog_msg_process
2019-11-28 11:41:36:371452 [DEBUG]  Signal Message to [MRCP Server] [0x7f01980008c0;3;2]
2019-11-28 11:41:36:371458 [DEBUG]  Wait for Messages [Demo Recog Engine]
2019-11-28 11:41:36:371464 [DEBUG]  Process Message [MRCP Server] [0x7f01980008c0;3;2]
2019-11-28 11:41:36:371468 [DEBUG]  Engine Channel Opened 0x7f01a8001a08 <233f0cec20554ef0@speechrecog> [OK]
2019-11-28 11:41:36:371472 [INFO]   Send Answer 0x7f01a8001a08 <233f0cec20554ef0> [c:1 a:1 v:0] Status OK
2019-11-28 11:41:36:371481 [INFO]   Local SDP 0x7f01a8001a08 <233f0cec20554ef0>
v=0
o=UniMRCPServer 0 0 IN IP4 10.6.0.16
s=-
c=IN IP4 10.6.0.16
t=0 0
m=application 1544 TCP/MRCPv2 1
a=setup:passive
a=connection:new
a=channel:233f0cec20554ef0@speechrecog
a=cmid:1
m=audio 0 RTP/AVP 19
a=mid:1

2019-11-28 11:41:36:371520 [DEBUG]  Wait for Messages [MRCP Server]
2019-11-28 11:41:36:372203 [INFO]   Receive SIP Event [nua_i_state] Status 200 OK [SIP-Agent-1]
2019-11-28 11:41:36:372239 [NOTICE] SIP Call State 0x7f01a8001a08 [completed]
2019-11-28 11:41:36:372489 [INFO]   Receive SIP Event [nua_i_ack] Status 200 OK [SIP-Agent-1]
2019-11-28 11:41:36:372514 [INFO]   Receive SIP Event [nua_i_state] Status 200 OK [SIP-Agent-1]
2019-11-28 11:41:36:372525 [NOTICE] SIP Call State 0x7f01a8001a08 [ready]
2019-11-28 11:41:36:372530 [INFO]   Receive SIP Event [nua_i_active] Status 200 Call active [SIP-Agent-1]
2019-11-28 11:41:36:372998 [DEBUG]  Process Signalled Descriptor [MRCPv2-Agent-1]
2019-11-28 11:41:36:373033 [NOTICE] Accepted TCP/MRCPv2 Connection 10.6.0.16:1544 <-> 10.6.0.16:33782
2019-11-28 11:41:36:373041 [DEBUG]  Wait for Messages [MRCPv2-Agent-1] timeout [600000]
2019-11-28 11:41:36:375031 [DEBUG]  Process Signalled Descriptor [MRCPv2-Agent-1]
2019-11-28 11:41:36:375048 [INFO]   TCP/MRCPv2 Peer Disconnected 10.6.0.16:1544 <-> 10.6.0.16:33782
2019-11-28 11:41:36:375163 [NOTICE] Destroy TCP/MRCPv2 Connection 10.6.0.16:1544 <-> 10.6.0.16:33782
2019-11-28 11:41:36:375175 [DEBUG]  Wait for Messages [MRCPv2-Agent-1]
2019-11-28 11:41:36:375884 [INFO]   Receive SIP Event [nua_i_bye] Status 200 Session Terminated [SIP-Agent-1]
2019-11-28 11:41:36:375898 [INFO]   Receive SIP Event [nua_i_state] Status 200 Session Terminated [SIP-Agent-1]
2019-11-28 11:41:36:375903 [NOTICE] SIP Call State 0x7f01a8001a08 [terminated]
2019-11-28 11:41:36:375909 [DEBUG]  Signal Message to [MRCP Server] [0x7f01a80040e0;1;2]
2019-11-28 11:41:36:375918 [INFO]   Receive SIP Event [nua_i_terminated] Status 200 Session Terminated [SIP-Agent-1]
2019-11-28 11:41:36:375928 [DEBUG]  Process Message [MRCP Server] [0x7f01a80040e0;1;2]
2019-11-28 11:41:36:375932 [DEBUG]  Dispatch Signaling Message [2]
2019-11-28 11:41:36:375935 [INFO]   Deactivate Session 0x7f01a8001a08 <233f0cec20554ef0>
2019-11-28 11:41:36:375939 [INFO]   Terminate Session 0x7f01a8001a08 <233f0cec20554ef0>
2019-11-28 11:41:36:375944 [DEBUG]  Remove Control Channel 0x7f01a8001a08 <233f0cec20554ef0@speechrecog> [0]
2019-11-28 11:41:36:375948 [DEBUG]  Signal Message to [MRCPv2-Agent-1] [0x7f01b000b060;1;0]
2019-11-28 11:41:36:375958 [DEBUG]  Subtract Media Termination 0x7f01a8001a08 <233f0cec20554ef0@media-tm>
2019-11-28 11:41:36:375963 [WARN]   >>>>>>>>>>>>>>>>> demo_recog_msg_signal
2019-11-28 11:41:36:375967 [DEBUG]  Signal Message to [Demo Recog Engine] [0x7f01b0002a00;1;0]
2019-11-28 11:41:36:375981 [DEBUG]  Subtract Media Termination 0x7f01a8001a08 <233f0cec20554ef0@rtp-tm>
2019-11-28 11:41:36:375986 [DEBUG]  Signal Message to [Media-Engine-1] [0x7f01b000af40;1;0]
2019-11-28 11:41:36:375991 [DEBUG]  Wait for Messages [MRCP Server]
2019-11-28 11:41:36:375993 [DEBUG]  Process Message [Demo Recog Engine] [0x7f01b0002a00;1;0]
2019-11-28 11:41:36:376001 [WARN]   >>>>>>>>>>>>>>>>> demo_recog_msg_process
2019-11-28 11:41:36:376002 [DEBUG]  Process Poller Wakeup [MRCPv2-Agent-1]
2019-11-28 11:41:36:376060 [DEBUG]  Process Message [MRCPv2-Agent-1] [0x7f01b000b060;1;0]
2019-11-28 11:41:36:376103 [INFO]   Remove Pending Control Channel <233f0cec20554ef0@speechrecog> [0]
2019-11-28 11:41:36:376108 [DEBUG]  Signal Message to [MRCP Server] [0x7f019c0008c0;2;2]
2019-11-28 11:41:36:376117 [DEBUG]  Wait for Messages [MRCPv2-Agent-1]
2019-11-28 11:41:36:376049 [DEBUG]  Signal Message to [MRCP Server] [0x7f01980008c0;3;3]
2019-11-28 11:41:36:376128 [DEBUG]  Wait for Messages [Demo Recog Engine]
2019-11-28 11:41:36:376135 [DEBUG]  Process Message [MRCP Server] [0x7f019c0008c0;2;2]
2019-11-28 11:41:36:376139 [DEBUG]  Control Channel Removed 0x7f01a8001a08 <233f0cec20554ef0@speechrecog>
2019-11-28 11:41:36:376143 [DEBUG]  Wait for Messages [MRCP Server]
2019-11-28 11:41:36:376146 [DEBUG]  Process Message [MRCP Server] [0x7f01980008c0;3;3]
2019-11-28 11:41:36:376150 [DEBUG]  Engine Channel Closed 0x7f01a8001a08 <233f0cec20554ef0@speechrecog>
2019-11-28 11:41:36:376153 [DEBUG]  Wait for Messages [MRCP Server]
2019-11-28 11:41:36:382264 [DEBUG]  Process Message [Media-Engine-1] [0x7f01b000af40;1;0]
2019-11-28 11:41:36:382593 [DEBUG]  Signal Message to [MRCP Server] [0x7f01940008c0;4;0]
2019-11-28 11:41:36:382656 [DEBUG]  Process Message [MRCP Server] [0x7f01940008c0;4;0]
2019-11-28 11:41:36:382670 [DEBUG]  Media Termination Subtracted 0x7f01a8001a08 <233f0cec20554ef0@media-tm>
2019-11-28 11:41:36:382680 [DEBUG]  Media Termination Subtracted 0x7f01a8001a08 <233f0cec20554ef0@rtp-tm>
2019-11-28 11:41:36:382691 [NOTICE] Remove Session <233f0cec20554ef0>
2019-11-28 11:41:36:382722 [INFO]   Session Terminated 0x7f01a8001a08 <233f0cec20554ef0>
2019-11-28 11:41:36:382779 [NOTICE] Destroy Session <233f0cec20554ef0>
2019-11-28 11:41:36:382798 [DEBUG]  Wait for Messages [MRCP Server]




Some things that I noticed:
First is the 2 ERRORs in the asterisk logs. I'm unable to figure out the cause for this though.

Also, another thing I noticed in the RTP/SIP logs, I don't see the codec information.
v=0
o=Asterisk 0 0 IN IP4 10.6.0.16
s=-
c=IN IP4 10.6.0.16
t=0 0
m=application 9 TCP/MRCPv2 1
a=setup:active
a=connection:new
a=resource:speechrecog
a=cmid:1
m=audio 0 RTP/AVP 19
a=mid:1

If I change the codec in mrcp.conf to just PCMA or PCMU etc., then the codec information shows up in the RTP logs with the payload type, sampling rate etc. However, this works only for codecs which have sampling rate as 8000  and I can't get it working for any codec with sampling rate of 16000.

Please let me know if I need to share any other information. Since I am new to this domain, it sometimes gets confusing with so many new terms.
Thanks for your help.


On Thursday, November 28, 2019 at 8:57:00 AM UTC+5:30, Arsen Chaloyan wrote:
Hi Jatin,

Both sides should advertise 16 kHz codecs in order for offer/answer to complete successfully. I cannot tell what your the exact problem is without the logs.

On Wed, Nov 27, 2019 at 5:28 AM Jatin Parekh <jatin...@haptik.co> wrote:
Hey everyone,
I've been going through sample Demo Recog plugin and trying to connect it to my own ASR service. The plugin requires PCM data at 16000Hz.

While going through the Asterisk/UniMRCP Integration document, there is a field called codecs with description "Specifies the RTP supported codecs."
Can someone explain what could be the possible values for this field?

I need to know this as I am stuck at a step where I keep receiving the error in my UniMRCP Server logs when I load my plugin.
2019-11-27 13:19:50:347005 [WARN]   Reject RTP Session *.*.*.*:5124 no codecs matched

I've been able to integrate Azure SR plugin with Asterisk/UniMRCP as per the docs and that works correctly. 
For my own plugin, I've tried using the 16000Hz specific codecs.
PCMU/97/16000 PCMA/98/16000 L16/99/16000 in mrcp.conf as well unimrcpserver.xml. 
However, I still keep getting the above error when starting the UniMRCP server.

Or if there is anything else that I would need to change in Asterisk or UniMRCP config to be able to send data at 16000Hz, please do let me know.

Thank you,

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Arsen Chaloyan

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Dec 3, 2019, 6:09:31 PM12/3/19
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Hi Jatin,

Configuration of UniMRCP server has no relevance to the issue you experienced. The problem is in the translation path between a codec used in the incoming SIP call leg and codecs configured for the MRCP leg on Asterisk.

And you seem to have posted a similar question here, which has the same resolution.


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Jatin Parekh

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Dec 5, 2019, 1:47:10 AM12/5/19
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Hey Arsen!

Thanks for the reply.
I figured out how to make it work (but not really sure if my understanding is correct).

In my pjsip.conf file in asterisk, I had added
disallow=all
allow=ulaw

It started working correctly when I changed
 allow=ulaw
to
allow=g722
in pjsip.conf.

I am guessing it was because of this only, that the 16khz codec was never chosen since ulaw is a 8khz codec.
Since g722 supports 16khz codecs, my plugin started working as expected.


On Wednesday, December 4, 2019 at 4:39:31 AM UTC+5:30, Arsen Chaloyan wrote:
Hi Jatin,

Configuration of UniMRCP server has no relevance to the issue you experienced. The problem is in the translation path between a codec used in the incoming SIP call leg and codecs configured for the MRCP leg on Asterisk.

And you seem to have posted a similar question here, which has the same resolution.


Arsen Chaloyan

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Dec 6, 2019, 6:37:07 PM12/6/19
to UniMRCP
Hi Jatin,

Yes, your understanding seems correct.

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