cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
351
Views
0
Helpful
2
Replies

Incoming fax from PSTN does not work intermittent.(only 5 -6 attempts succeds out of 9)

devraj123
Level 1
Level 1

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,

2 Replies 2

Ryan Huff
Level 4
Level 4

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 ..)

Hi Ryan,

Seems not worked.

devraj

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: