06-20-2016 10:49 PM - edited 03-17-2019 07:18 AM
Hi All,
Having issue with FAX:
call flow-
FAX-------PSTN---------- MGCP gateway -------------CUCM 9.x------------Sip trunk------------------------Right FAX server
Incoming fax from PSTN does not work , its intermittent not everyday.(only 5 -6 attempts succeeds out of 9)
we have 3 numbers for Faxes 3607-0382, 3607-0384 and 3607-0386
when PSTN user dials thses numbers then some fax misses. I mean PSTN sent 9 faxes but received only 5.
attached Gateway configuration + CUCM logs,
06-21-2016 07:13 PM
Under voice service voip, switch to:
fax protocol t38 version 0 ls-redundancy 5 hs-redundancy 2 fallback g711ulaw
Under global config mode:
no mgcp fax t38 ecm
mgcp fax rate 14400
mgcp fax-relay sg3-to-g3
After that, do a "no mgcp / mgcp" restart on the gateway and then reset the gateway config in UC manager. If the issue still hasn't improved, remove the T.38 packet redundancy
no mgcp fax t38 ls_redundancy 5
no mgcp fax t38 hs_redundancy 2
Give that a go and let me know the results :)
Thanks,
Ryan
(.. Please rate helpful posts ..)
06-26-2016 09:36 PM
Hi Ryan,
Seems not worked.
devraj
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