t38pt_udptl=yes,redundancy,maxdatagram=200 - прописал только что
sip.conf
[general]
callcounter=yes
#include sip_general_additional.conf
#include sip_general_custom.conf
#include sip_nat.conf
#include sip_registrations_custom.conf
#include sip_registrations.conf
#include sip_custom.conf
#include sip_additional.conf
#include sip_custom_post.conf
sip_custom, sip_custom_post, sip_general_custom, sip_notify_custom, sip_registrations_custom,sip_notify_additional - пустые
sip_additional.conf
[77]
deny=0.0.0.0/0.0.0.0
secret=77
dtmfmode=rfc2833
canreinvite=no
context=from-internal
host=dynamic
trustrpid=yes
sendrpid=no
type=friend
nat=no
port=5060
qualify=yes
qualifyfreq=60
transport=udp
encryption=no
callgroup=
pickupgroup=
dial=SIP/77
mailbox=77@default
permit=0.0.0.0/0.0.0.0
callerid=Vlad 77 <77>
callcounter=yes
faxdetect=no
[Er_tel2022010]
disallow=all
username=номертелефона-747*****
type=friend
secret=*****
qualify=yes
nat=no
insecure=invite
host=188.187.237.6
fromuser=номертелефона-747*****
fromdomen=188.187.237.6
context=from-pstn-toheader
canreinvite=yes
call-limit=4
allow=alaw
t38pt_udptl=yes,redundancy,maxdatagram=200
[Er_tel_u1]
disallow=all
type=friend
qualify=yes
nat=no
insecure=port
host=188.187.237.4
context=from-pstn-toheader
canreinvite=yes
call-limit=4
allow=alaw
[Er_tel_u2]
disallow=all
type=friend
qualify=yes
nat=no
insecure=port
host=188.187.237.5
context=from-pstn-toheader
canreinvite=yes
call-limit=2
allow=alaw
[Er_tel_u3]
context=from-trunk-sip-Er_tel_u3
[mtt_1]
disallow=all
secret=**************
username=логин
fromuser=номертелефона-747*****
host=sip.mtt.ru
fromdomain=sip.mtt.ru
insecure=invite
allow=g729,alaw,ulaw,speex
nat=no
directmedia=no
canreinvite=no
type=peer
context=from-trunk-sip-mtt_1
sip_general_additional
vmexten=*97
accept_outofcall_messages=yes
auth_message_requests=no
outofcall_message_context=phone_context
disallow=all
allow=ulaw
allow=alaw
context=from-sip-external
callerid=Unknown
notifyringing=yes
notifyhold=yes
tos_sip=cs3
tos_audio=ef
tos_video=af41
alwaysauthreject=yes
useragent=FPBX-2.10.1(1.8.20.1)
sip_nat.conf
externip=наш ip адрес
sip_notify.conf
#include sip_notify_custom.conf
#include sip_notify_additional.conf
sip_registrations.conf
register=а-номер:пароль:номер@188.187.237.6:5060
register=а-номер:пароль:логин@sip.mtt.ru/а-номер