Fax Not working with TSP,CUCM v7,ATA187

[Mohamed Ali D.A]

Upon FAX tone detection the TSP  sending SDP to switch call to T.38 for FAX transport, But Call Manger is sending SIP error "488 not acceptable media" to this switchover is not hapenning.

Find the attaced Flow Diagram from wireshark. 10.116.10.12 is voice Gateway IP(CUBE) and 10.116.10.10 is CUCM ip Address(version 7.1.5b)

[Mohamed Ali D.A]

Hi solved this fax issue by configuring CUBE as CME and i registered the ATA in CME and we are able to send and receive fax.

[zdesignstudio]

What you have done is not a preferred method because it will make troubleshooting issues harder. I would move it back to CUCM and then confgure faxing for T38 with a fallback of passthrough.

fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback pass-through g711ulaw