Sms chat not working on freepbx with tow linephone softphone
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 i am using freepbx 15 distro Other SIP Settings 
 accept_outofcall_message = yes
 outofcall_message_contex = astsms
 auth_message_requests = yes
 Write below lines in extensions_custom.conf file. This is dialplan to send IM.
 [astsms]
 ;Deliver to local 3-digit extension
 exten => _XXX,1,MessageSend(sip:${EXTEN},${MESSAGE(from)})
 same => n,Hangup()res_pjsip_header_funcs.c:454 func_read_header: This function requires a PJSIP channel. 
 [2021-06-16 22:34:12] ERROR[22726][C-00000005]: res_pjsip_header_funcs.c:454 func_read_header: This function requires a PJSIP channel.
 [2021-06-16 22:34:19] WARNING[3301]: chan_sip.c:4142 retrans_pkt: Retransmission timeout reached on transmission 83105471079628703765225689606832e7 for seqno 103 (Critical Request) – See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
 Packet timed out after 6401ms with no response
 [2021-06-16 22:34:19] WARNING[3301]: chan_sip.c:4142 retrans_pkt: Retransmission timeout reached on transmission 10635857318019912468722712362a17e7 for seqno 103 (Critical Request) – See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
 Packet timed out after 6400ms with no response
 [2021-06-16 22:34:19] WARNING[3301]: chan_sip.c:4142 retrans_pkt: Retransmission timeout reached on transmission 177607474807695456872236a3608968e7 for seqno 103 (Critical Request) – See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
 Packet timed out after 6402ms with no response
 [2021-06-16 22:34:19] WARNING[3301]: chan_sip.c:4142 retrans_pkt: Retransmission timeout reached on transmission 163608105081901038768722bc289057e7 for seqno 103 (Critical Request) – See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
 Packet timed out after 6400ms with no response
 [2021-06-16 22:34:19] WARNING[3301]: chan_sip.c:4142 retrans_pkt: Retransmission timeout reached on transmission 38370651581339966687222681d658b7e7 for seqno 103 (Critical Request) – See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
 Packet timed out after 6401ms with no response
 [2021-06-16 22:34:19] WARNING[3301]: chan_sip.c:4142 retrans_pkt: Retransmission timeout reached on transmission 92561586182471080867122238561512e7 for seqno 103 (Critical Request) – See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
 Packet timed out after 6400ms with no response
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 sip_general_custom.conf 
 accept_outofcall_message=yes
 outofcall_message_context=dialplan_name
 auth_message_requests=yes
 …sip_general_additional.conf 
 accept_outofcall_message=yes
 auth_message_requests=no
 outofcall_message_context=dpma_message_context
 faxdetect=no
 vmexten=*97
 useragent=FPBX-15.0.17.34(17.9.3)
 language=en
 disallow=all
 allow=ulaw
 allow=alaw
 allow=gsm
 allow=g726
 allow=g722
 context=from-sip-external
 callerid=Unknown
 notifyringing=yes
 notifyhold=yes
 tos_sip=cs3
 tos_audio=ef
 tos_video=af41
 alwaysauthreject=yes
 limitonpeers=yes
 accept_outofcall_message=yes
 outofcall_message_context=astsms
 auth_message_requests=yes
 context=from-sip-external
 callerid=Unknown
 tcpenable=no
 callevents=yes
 jbenable=no
 checkmwi=10
 maxexpiry=3600
 minexpiry=60
 srvlookup=no
 tlsenable=no
 allowguest=yes
 notifyhold=yes
 rtptimeout=30
 canreinvite=no
 tlsbindaddr=[::]:5161
 rtpkeepalive=0
 videosupport=no
 defaultexpiry=120
 notifyringing=yes
 maxcallbitrate=384
 rtpholdtimeout=300
 g726nonstandard=no
 registertimeout=20
 tlsclientmethod=tlsv1
 registerattempts=0
 nat=force_rport,comedia
 ALLOW_SIP_ANON=no
 udpbindaddr=0.0.0.0:5060
 tlscafile=/etc/pki/tls/certs/ca-bundle.crt
 externip=104.145.12.182
 localnet=192.168.1.6/24
 …sip_additional.conf 
 [100]
 deny=0.0.0.0/0.0.0.0
 secret=12345
 dtmfmode=rfc2833
 canreinvite=no
 context=from-internal
 host=dynamic
 defaultuser=
 trustrpid=yes
 user_eq_phone=no
 sendrpid=pai
 type=friend
 session-timers=accept
 nat=force_rport,comedia
 port=5060
 qualify=yes
 qualifyfreq=60
 transport=udp
 avpf=no
 force_avp=no
 icesupport=no
 rtcp_mux=no
 encryption=no
 namedcallgroup=
 namedpickupgroup=
 dial=SIP/100
 accountcode=
 permit=0.0.0.0/0.0.0.0
 callerid=Omer RIT <100>
 recordonfeature=apprecord
 recordofffeature=apprecord
 callcounter=yes
 faxdetect=no[101] 
 deny=0.0.0.0/0.0.0.0
 secret=123
 dtmfmode=rfc2833
 canreinvite=no
 context=from-internal
 host=dynamic
 defaultuser=
 trustrpid=yes
 user_eq_phone=no
 sendrpid=pai
 type=friend
 session-timers=accept
 nat=force_rport,comedia
 port=5060
 qualify=yes
 qualifyfreq=60
 transport=udp
 avpf=no
 force_avp=no
 icesupport=no
 rtcp_mux=no
 encryption=no
 namedcallgroup=
 namedpickupgroup=
 dial=SIP/101
 accountcode=
 permit=0.0.0.0/0.0.0.0
 callerid=Ahmed RIT <101>
 recordonfeature=apprecord
 recordofffeature=apprecord
 callcounter=yes
 faxdetect=no