Hello Everyone,
Below is the FreePBX version I am using:
FW Console - FreePBX Utility 16.0.40.13
Below is the Asterisk version information:
Asterisk 19.8.0
Fax Settings:
FAX For Asterisk Settings:
ECM: Enabled
Status Events: Off
Minimum Bit Rate: 9600
Maximum Bit Rate: 14400
Modem Modulations Allowed: V17,V27,V29
T.38 Negotiation Timeout: 10000
FAX Technology Modules:
Spandsp (Spandsp FAX Driver) Settings:
Fax capabilities:
Registered FAX Technology Modules:
Type : Spandsp
Description : Spandsp FAX Driver
Capabilities : SEND RECEIVE T.38 G.711 GATEWAY
1 registered modules
Fax Stats:
FAX Statistics:
Current Sessions : 0
Reserved Sessions : 0
Transmit Attempts : 0
Receive Attempts : 21
Completed FAXes : 21
Failed FAXes : 15
Spandsp G.711
Success : 0
Switched to T.38 : 0
Call Dropped : 0
No FAX : 0
Negotiation Failed : 0
Train Failure : 0
Retries Exceeded : 0
Protocol Error : 0
TX Protocol Error : 0
RX Protocol Error : 0
File Error : 0
Memory Error : 0
Unknown Error : 0
Spandsp T.38
Success : 6
Call Dropped : 1
No FAX : 0
Negotiation Failed : 0
Train Failure : 0
Retries Exceeded : 13
Protocol Error : 0
TX Protocol Error : 1
RX Protocol Error : 0
File Error : 0
Memory Error : 0
Unknown Error : 0
We are facing problem of incoming fax fail. We are getting below error:
– Executing [s@ext-fax:4] ReceiveFAX(“PJSIP/trunk2-00000022”, “/var/spool/asterisk/fax/1754366815.39.tif,f”) in new stack
– Channel ‘PJSIP/trunk2-00000022’ receiving FAX ‘/var/spool/asterisk/fax/1754366815.39.tif’
[2025-08-05 04:07:00] WARNING[22161][C-0000001c]: res_rtp_asterisk.c:7723 ast_rtp_read: RTP Read too short
embervoip*CLI>
– Executing [s@ext-fax:5] ExecIf(“PJSIP/trunk2-00000022”, “1?Set(FAXSTATUS=“FAILED: error: Disconnected after permitted retries statusstr: Disconnected after permitted retries”)”) in new stack
– Executing [s@ext-fax:6] Hangup(“PJSIP/trunk2-00000022”, “”) in new stack
== Spawn extension (ext-fax, s, 6) exited non-zero on ‘PJSIP/trunk2-00000022’
– Executing [h@ext-fax:1] GotoIf(“PJSIP/trunk2-00000022”, “1?failed”) in new stack
– Goto (ext-fax,h,104)
– Executing [h@ext-fax:104] NoOp(“PJSIP/trunk2-00000022”, “FAX “FAILED: error: Disconnected after permitted retries statusstr: Disconnected after permitted retries” for: FAX (306) , From: “SEATTLE WA” <206512XXXX>”) in new stack
Sometimes it works fine, but most of time I get this error.
We are using bandwidth.com as provider to send and receive faxes.
Please assist to fix this problem.
Thanks in advance.