Конфигурация pjsip.conf следующая
[0.0.0.0-udp]
type=transport
protocol=udp
bind=0.0.0.0:5060
[endpoint0](!)
type=endpoint
transport=0.0.0.0-udp
disallow=all
allow=alaw
allow=ulaw
allow=g729
t38_udptl=no
t38_udptl_ec=none
fax_detect=no
t38_udptl_nat=no
dtmf_mode=auto
direct_media=yes
from_domain ...

