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Store and Forward fax (T.37 ) over SIP trunk on CME 8.6 does it possible

Level 1
Level 1

Store and Forward fax T.37 over SIP trunk on CME 8.6

My company utilize CME 8.6 with SCCP phones , 4 analog POTS line true FXO/DID ports .

CME is configured for UM on Exchange 2010 for voice mailboxes and store and forward fax messages with IVR ON-RAMP TCL script.

Everything working fine, incoming FAX messages coming to email of users.

Yesterday company move to another location and we get SIP trunk instead 4 POTS analog lines.

Without problems we configure CME for using SIP trunks for voice calls,

but I do not know if it possible to configure CME to use “store and forward faxes (T.37) for calls received true SIP trunk.

I temporally attach old G3 fax machine to FXS port , now I receive faxes over fax pass-through mechanism but users want fax messages forwarded to their email mailboxes

Does anybody know if is it possible to use ON-RAMP scripts on CME for call received from SIP trunk .

And if so could you be so kind to help me. Please!

I presume that is possible and I need only to forward incoming calls. It was easy with POTS I just needed

voice-port 0/0/3

connection plar opx 777

caller-id enable

every call received on dedicated analog line CME forward to number 777

dial-peer voice 5002 pots

service onramp

incoming called-number 777


port 0/0/3

then DID and IVR onramp to STORE fax

dial-peer voice 5001 mmoip

service fax_on_vfc_onramp_app out-bound

destination-pattern 777

information-type fax

session target

and call app to FORWARD fax

now I have dial-peer for incoming calls with IVR scrip how will change called number to extension number

dial-peer voice 5000 voip

service toroute

session protocol sipv2

session target sip-server

incoming called-number 11223344556677

voice-class codec 1

voice-class sip dtmf-relay force rtp-nte

dtmf-relay rtp-nte

no vad

but when receive call and script change called number to 777 call could not be forwarded

debug log I have

Jul 26 16:20:23.799: //1076/9A21AE858539/CCAPI/cc_api_call_disconnected:

Cause Value=16, Interface=0x2B0967F8, Call Id=1076

Jul 26 16:20:23.799: //1076/9A21AE858539/CCAPI/cc_api_call_disconnected:

Call Entry(Responsed=FALSE, Cause Value=16, Retry Count=0)

Jul 26 16:20:23.799: //1076/9A21AE858539/CCAPI/ccCallDisconnect:

Cause Value=16, Tag=0x0, Call Entry(Previous Disconnect Cause=0, Disconnect Cause=16)

Jul 26 16:20:23.799: //1076/9A21AE858539/CCAPI/ccCallDisconnect:

Cause Value=16, Call Entry(Responsed=TRUE, Cause Value=16)

Jul 26 16:20:23.807: //1076/9A21AE858539/CCAPI/cc_api_call_disconnect_done:

Disposition=0, Interface=0x2B0967F8, Tag=0x0, Call Id=1076,

Call Entry(Disconnect Cause=16, Voice Class Cause Code=0, Retry Count=0)

Jul 26 16:20:23.807: //1076/9A21AE858539/CCAPI/cc_api_call_disconnect_done:

Call Disconnect Event Sent


3 Replies 3

paolo bevilacqua
Hall of Fame
Hall of Fame

T.37 is not supported on VoIP trunks, because in such calls there is no DSP available for the function.

You can configure T.37 on the PSTN gateway, and it will work the same.

Does anyone know some SIP Fax server software with T.37 support

Paolo can you give some examples for T.37 on the PSTN gateway I am not sure what I need to do.

10x in advanced.

T.37:software for Windows:

Cisco documentation:

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