Unable to find a codec translation path: (opus) -> (ulaw)

I am trying to connect audio call with web socket. But when it going to connect with web phone, following error occurred.

 -- Executing [7@English_lang_testing:3] Dial("PJSIP/registrar-00000000", "PJSIP/6002,60,tTmL()") in new stack
    -- Called PJSIP/6002
    -- Started music on hold, class 'default', on channel 'PJSIP/registrar-00000000'
    -- PJSIP/6002-00000001 is ringing
[May  8 14:28:21] NOTICE[17619][C-00000001]: translate.c:603 ast_translate: 923 lost frame(s) 924/0 (gsm@8000)->(slin@8000)->(ulaw@8000)
       > 0x562ea5107330 -- Strict RTP learning after remote address set to: 124.43.67.53:56192
[May  8 14:28:22] WARNING[17561]: channel.c:5765 set_format: Unable to find a codec translation path: (opus) -> (ulaw)
[May  8 14:28:22] WARNING[17561]: channel.c:5765 set_format: Unable to find a codec translation path: (ulaw) -> (opus)
    -- PJSIP/6002-00000001 answered PJSIP/registrar-00000000
    -- Stopped music on hold on PJSIP/registrar-00000000
[May  8 14:28:22] WARNING[17619][C-00000001]: channel.c:6756 ast_channel_make_compatible_helper: No path to translate from PJSIP/6002-00000001 to PJSIP/registrar-00000000
[May  8 14:28:22] WARNING[17619][C-00000001]: app_dial.c:3381 dial_exec_full: Had to drop call because I couldn't make PJSIP/registrar-00000000 compatible with PJSIP/6002-00000001
  == Spawn extension (English_lang_testing, 7, 3) exited non-zero on 'PJSIP/registrar-00000000'

This is my PJSIP.CONF file code

[general]
max_forwards=70
tlsenable=yes
tlsbindaddr=0.0.0.0:8089
tlscertfile=/etc/asterisk/keys/asterisk.pem
tlsprivatekey=/etc/asterisk/keys/asterisk.pem

[system]
type=system
timer_t1=500
timer_b=32000
disable_tcp_switch=yes

[transport-tcp]
type=transport
protocol=tcp
bind=0.0.0.0:5060
allow_reload=yes

[transport-udp]
type=transport
protocol=udp
bind=0.0.0.0:5060
allow_reload=yes

[transport-tls]
type=transport
protocol=tls
bind=0.0.0.0:5061
method=tlsv1_2  ; Make sure this is correctly spelled and placed
cert_file=/etc/asterisk/keys/dmsca.pem
priv_key_file=/etc/asterisk/keys/dmscakey.pem
cipher=ADH-AES256-SHA,ADH-AES128-SHA

[transport-ws]
type=transport
protocol=ws ; Use `wss` for WebSocket Secure
bind=0.0.0.0:8088 ; Adjust the IP and port as necessary

[transport-wss]
type=transport
protocol=wss ; WebSocket Secure
bind=0.0.0.0:8089 ; Adjust the IP and port as necessary
cert_file=/etc/asterisk/keys/asterisk.pem ; SSL certificate file
priv_key_file=/etc/asterisk/keys/asterisk.pem ; SSL private key file


[authentication]
[basic-options](!)
dtmfmode=rfc2833
context=from-office
type=friend
[natted-phone](!,basic-options)
directmedia=no
host=dynamic
[public-phone](!,basic-options)
directmedia=yes
[my-codecs](!)
disallow=all
allow=ilbc
allow=g729
allow=gsm
allow=g723
allow=ulaw
[ulaw-phone](!)
disallow=all
allow=ulaw

[registrar]
type=identify
endpoint=registrar
match=172.16.1.1
match=172.20.10.86

[registrar]
type=aor
contact=sip:*@172.20.10.86:5060

[registrar]
type=endpoint
transport=transport-udp
context=from_external    ;dmse_IVR
disallow=all
allow=ulaw
allow=opus
aors=registrar
force_rport=yes
direct_media=no
rtp_symmetric=yes
rtp_timeout=120

[6002]
type=endpoint
transport=transport-wss
context=from_external
disallow=all
allow=opus
allow=ulaw
aors=6002
auth=6002
media_encryption=dtls
dtls_auto_generate_cert=yes
dtls_verify=fingerprint
dtls_setup=actpass
ice_support=yes
direct_media=no
force_rport=yes
rewrite_contact=yes
webrtc=yes

[6002]
type=auth
auth_type=userpass
password=12345
username=6002

[6002]
type=aor
max_contacts=100
remove_existing=yes


How fix above codec issue??

Sangoma provides a binary codec_opus which is not installed by default. It can be installed by going into menuselect and choosing it in the Codecs section, and then installing Asterisk again.

I installed codec_opus manually.

dms*CLI> core show translation paths opus
--- Translation paths SRC Codec "opus" sample rate 48000 ---
        opus:48000       To amr:8000        : No Translation Path
        opus:48000       To amrwb:16000     : No Translation Path
        opus:48000       To codec2:8000     : No Translation Path
        opus:48000       To g723:8000       : No Translation Path
        opus:48000       To ulaw:8000       : No Translation Path
        opus:48000       To alaw:8000       : No Translation Path
        opus:48000       To gsm:8000        : No Translation Path
        opus:48000       To g726:8000       : No Translation Path
        opus:48000       To g726aal2:8000   : No Translation Path
        opus:48000       To adpcm:8000      : No Translation Path
        opus:48000       To slin:8000       : No Translation Path
        opus:48000       To slin:12000      : No Translation Path
        opus:48000       To slin:16000      : No Translation Path
        opus:48000       To slin:24000      : No Translation Path
        opus:48000       To slin:32000      : No Translation Path
        opus:48000       To slin:44100      : No Translation Path
        opus:48000       To slin:48000      : No Translation Path
        opus:48000       To slin:96000      : No Translation Path
        opus:48000       To slin:192000     : No Translation Path
        opus:48000       To lpc10:8000      : No Translation Path
        opus:48000       To g729:8000       : No Translation Path
        opus:48000       To speex:8000      : No Translation Path
        opus:48000       To speex:16000     : No Translation Path
        opus:48000       To speex:32000     : No Translation Path
        opus:48000       To ilbc:8000       : No Translation Path
        opus:48000       To g722:16000      : No Translation Path
        opus:48000       To siren7:16000    : No Translation Path
        opus:48000       To siren14:32000   : No Translation Path
        opus:48000       To testlaw:8000    : No Translation Path
        opus:48000       To g719:48000      : No Translation Path
        opus:48000       To none:8000       : No Translation Path
        opus:48000       To silk:8000       : No Translation Path
        opus:48000       To silk:12000      : No Translation Path
        opus:48000       To silk:16000      : No Translation Path
        opus:48000       To silk:24000      : No Translation Path

dms*CLI> core show translation
         Translation times between formats (in microseconds) for one second of data
          Source Format (Rows) Destination Format (Columns)

            amr amrwb codec2  ulaw  alaw   gsm  g726 g726aal2 adpcm slin8 slin12 slin16 slin24 slin32 slin44 slin48 slin96 slin192 lpc10 speex8 speex16 speex32  g722 testlaw
      amr     - 23000  15000 15000 15000 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 17250   15000
    amrwb 23500     -  23500 23500 23500 23500 23500    23500 23500 17500  17500   9000  17000  17000  17000  17000  17000   17000 23500  23500   15000   23000 15000   23500
   codec2 15000 23000      - 15000 15000 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 17250   15000
     ulaw 15000 23000  15000     -  9150 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 17250   15000
     alaw 15000 23000  15000  9150     - 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 17250   15000
      gsm 15000 23000  15000 15000 15000     - 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 17250   15000
     g726 15000 23000  15000 15000 15000 15000     -    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 17250   15000
 g726aal2 15000 23000  15000 15000 15000 15000 15000        - 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 17250   15000
    adpcm 15000 23000  15000 15000 15000 15000 15000    15000     -  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 17250   15000
    slin8  6000 14000   6000  6000  6000  6000  6000     6000  6000     -   8000   8000   8000   8000   8000   8000   8000    8000  6000   6000   14000   14000  8250    6000
   slin12 14500 14000  14500 14500 14500 14500 14500    14500 14500  8500      -   8000   8000   8000   8000   8000   8000    8000 14500  14500   14000   14000 14000   14500
   slin16 14500  6000  14500 14500 14500 14500 14500    14500 14500  8500   8500      -   8000   8000   8000   8000   8000    8000 14500  14500    6000   14000  6000   14500
   slin24 14500 14500  14500 14500 14500 14500 14500    14500 14500  8500   8500   8500      -   8000   8000   8000   8000    8000 14500  14500   14500   14000 14500   14500
   slin32 14500 14500  14500 14500 14500 14500 14500    14500 14500  8500   8500   8500   8500      -   8000   8000   8000    8000 14500  14500   14500    6000 14500   14500
   slin44 14500 14500  14500 14500 14500 14500 14500    14500 14500  8500   8500   8500   8500   8500      -   8000   8000    8000 14500  14500   14500   14500 14500   14500
   slin48 14500 14500  14500 14500 14500 14500 14500    14500 14500  8500   8500   8500   8500   8500   8500      -   8000    8000 14500  14500   14500   14500 14500   14500
   slin96 14500 14500  14500 14500 14500 14500 14500    14500 14500  8500   8500   8500   8500   8500   8500   8500      -    8000 14500  14500   14500   14500 14500   14500
  slin192 14500 14500  14500 14500 14500 14500 14500    14500 14500  8500   8500   8500   8500   8500   8500   8500   8500       - 14500  14500   14500   14500 14500   14500
    lpc10 15000 23000  15000 15000 15000 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000     -  15000   23000   23000 17250   15000
   speex8 15000 23000  15000 15000 15000 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000      -   23000   23000 17250   15000
  speex16 23500 15000  23500 23500 23500 23500 23500    23500 23500 17500  17500   9000  17000  17000  17000  17000  17000   17000 23500  23500       -   23000 15000   23500
  speex32 23500 23500  23500 23500 23500 23500 23500    23500 23500 17500  17500  17500  17500   9000  17000  17000  17000   17000 23500  23500   23500       - 23500   23500
     g722 15600 15000  15600 15600 15600 15600 15600    15600 15600  9600  17500   9000  17000  17000  17000  17000  17000   17000 15600  15600   15000   23000     -   15600
  testlaw 15000 23000  15000 15000 15000 15000 15000    15000 15000  9000  17000  17000  17000  17000  17000  17000  17000   17000 15000  15000   23000   23000 17250       -

But problem not solved…

It is not installed or active.

Yes. It is worked. After update codec_opus module, worked. Thank you

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