why always is "Final transmission status : processing", and after is nothing, my fax cannot sending?

[ph199999]

what this problems???pls help me!!
[2023-04-20 01:38:17] [4213] [WARNING] Session write failed
[2023-04-20 01:38:17] [4211] [FLOW] =================> transmission execution <=================
[2023-04-20 01:38:17] [4211] [FLOW] Executing transmission with id : 43
[2023-04-20 01:38:17] [4211] [FLOW] Attempting with spool_id : 43
[2023-04-20 01:38:17] [4211] [FLOW] Executing program : sendfax(74)
[2023-04-20 01:38:17] [4211] [FLOW] Executing application : originate(227)
[2023-04-20 01:38:17] [4211] [FLOW] Final spool status : started
[2023-04-20 01:38:17] [4211] [FLOW] Final transmission status : processing
[2023-04-20 01:38:17] [4211] [FLOW] -----------------> transaction ended <-----------------
[2023-04-20 01:38:17] [4211] [FLOW] Transmission execution completed
[2023-04-20 01:38:56] [4214] [WARNING] Session write failed
[2023-04-20 01:39:03] [4214] [WARNING] Session write failed
[2023-04-20 01:39:06] [4214] [WARNING] Session write failed
[2023-04-20 01:39:06] [4214] [WARNING] Session write failed
why always is "Final transmission status : processing", and after is nothing, my fax cannot sending?

[ph199999]

is my freeswitch's problems?

[ictvision]

Please check and confirm SIP trunk is properly configured in freeswitch