Asterisk SpanDSP Fax Send Problem

Hi, i use working perfectly Asterisk 15.6 and i installed SpanDSP 0.0.6.
fax configured for asterisk. I have a Cisco ATA 187 device that converts digital line to analogue, and it works and I have assigned my number.

my sip.conf settings for fax machine

[0995]
type=friend
context=asterisk
defaultuser=0995
callerid=FAXTEST <0995>
allow=all
secret=123456
host=dynamic
dtmfmode=rfc2833
canreinvite=yes
nat=no
port=5060
dial=SIP/0995
transport=udp,tcp
;FAX support
t38_udptl=yes
t38_udptl_ec=redundancy
t38_udptl_maxdatagram=400
fax_detect=yes

my extensions.conf settings

exten => 0995,1, Answer
exten => 0995,2, Dial (SIP / 0995)
exten => fax1,1, Dial (SIP / 0995,30)
exten => fax1,2, Congestion
exten => fax1,102, Congestion

I receive a fax from outside to inside fax lines perfectly, but I cannot send faxes from the outside. when I dial the fax number, it called for 10 seconds and outside fax line will ringing after then says “the number you have dialed is not in service”. what is the problem ?

ALSO i tested my local two fax machines working perfectly its sends and receives faxes. and i use res_fax.so + res_spandsp.so modules together.

What occurs in the console? Any messages?

ok. i fix and find the solution. my config is working correctly. problem is other fax system.