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trouble sending fax outside 1

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WANman94

IS-IT--Management
Jun 9, 2016
2
0
0
US
CS1000 Avaya 7.5 release,on an IP flex service. when users try to send faxes out the fax machine on the outside will answer and give one beep (initiating the handshake), then immediately disconnect the call. the timer on my phone shows this call disconnect, like their fax machine is choosing to just hang up.
calling from my cellphone the fax machine answers and tries multiple handshake attempts before ending the call.

we can receive from outside, and send/receive from internal. but sending fax outside our PBX is disconnecting.

any ideas to try? Ive tried modem pass thru - MPTA and D

much appreciated!
 
make sure class of service for faxing is allowed here is an analog line on 7.5 when we went to 7.5 to 5.5 had to change all analog line to match the cls listed below .

CTD DTN FBD XFD WTA THFD FND HTD ONS
LPR XRD AGRD CWD SWD MWD RMMD LPD XHD SLKD CCSD LND TVD
CFTD SFD MRD C6D CNID CLBD AUTU
ICDD CDMD LLCN EHTD MCTD
GPUD DPUD CFXD ARHD OVDD AGTD CLTD LDTD ASCD SDND
MBXD CPFA CPTA DDGA NAMA MIND
MCRD
EXR0 SHL ABDD CFHD DNDY DNO3
CWND USMD USRD BNRD OCBD RTDD RBDD RBHD FAXA CNUD CNAD PGND FTTC
CDMR PRED MCDD T87D SBMD PKCH MPTA ELCD
 
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