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ATA186 FAX sends but not receive


I have a question regarding the ATA186:

I am trying to connect a fax behind an ATA186 device, but the problem is that I can send faxes without any problem, but I can not receive them.

It is a fact that when I am sending a fax the call is passing just through the Gateway (not the CM) and it is working fine, BUT, when I try to receive a fax the call is passing through the CM and it is NOT working at all. Another thing is that I can talk (voice) using the fax extension (just the fax is not working).

The versions that I am using are:

CM - v3.2

ATA - v2.14

Gateway - 12.1(5)

What could be the problem?

Community Member

Re: ATA186 FAX sends but not receive


Check configuration of gateway

- enable the fax/modem passthrough feature

- disable the fax relay feature

The settings described here may apply only to gateways using the H.323 or SIP signaling protocols. For detailed information for setting up your IOS gateways and feature availability, please refer to the document “Cisco Fax Services over IP”.

CM no problem

Update ATA Version to 2.15

Check Fax configuration (setup tone)

Check this document

Configuring and Debugging Fax Services

for the Cisco ATA 186/188- EDCS Document ID: ENG-235572

Revision: A

Hope it helps


Community Member

Re: ATA186 FAX sends but not receive

Thanks for your response,

The config that I have on the GW is the following:

dial-peer voice 2800 voip

destination-pattern 30..

session target ipv4: ! Call Manager IP addr.

dtmf-relay h245-alphanumeric

ip precedence 5

no vad


dial-peer voice 10 pots

destination-pattern 9T


port 0/0:0

no register e164


dial-peer voice 20 voip

destination-pattern 3033

session target ipv4: ! ATA IP Addr.

ip precedence 5

fax relay disable

codec g711alaw

I try to enable the fax/modem passthrough mode, but the IOS version of the GW does not allowed it. Do you think I should try upgrading the IOS?

Do you see anything wrong with the config?




Community Member

Re: ATA186 FAX sends but not receive


Had the same problem and this config worked for me.

dial-peer voice 2019 voip

destination-pattern 2019

modem passthrough nse codec g711ulaw

session target ipv4:

codec g711ulaw

fax rate disable


CallManager 3.1(4)

Gateway is 2620XM IOS ver 12.2-15.T8

ATA version: ata186 (Build 020919a)

ATA Port 1 setup as a 7960 per Cisco instructions for CCM 3.1 in G729 DP

ATA Port 2 setup as a 7960 per Cisco instructions for CCM 3.1 in G711 DP

ATA Port1 - Polycom conference phone

ATA Port2 - Fax

Hope this helps,


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