ATA: Not able to receive FAX

[krishnamurthy.mh]

Hi,

Running UCM 7.x and using MGCP Gateway.

Configured ATA and it has been registered.Able to make voice call from ATA.We can able to send a fax but not able to receive the fax.Sending end fax machine displays a message " communication error"

Please help me out!!!

[Rui Carlos Antunes]

If you call the FAX DDI and/or internal extension from a phone, does the FAX machine answer the call?

Is the ATA using SCCP/Skinny?

[krishnamurthy.mh]

Hi Rui,

Thanks for u r reply.

Yes we can able do call/receive internal extension from analog phone which is connected to ATA. (This fax machine doesn't have handset)

We can able to send the Fax but not able to receive.

Regards,

[Rui Carlos Antunes]

Hi.

The question was not really that.

The question was, if you are able, from a Cisco IP Phone, to call the fax connected to the ATA and if the fax machine answers.

Same question, but now when you call, not from a Cisco IP Phone, but from an external phone (for example, a cell phone).

These two questions help understand if the fax machine answers or not the call. If the fax machine does not answer the call, it may be a problem with the fax machine configuration. If the fax machine answers the call, it should be a problem with the settings of the CallManager (problems with internal faxes) or VoIP Gateway (problems with external faxes).

[Ahmed Usman Habib]

Hi

I am having a similar issue.

I am using H323 with CUCM6.1.2. I can call the fax from everywhere without a problem. For fax calls, Fax machines shows "receiving" then the call is dropped. Sender gets "communication error".

I have the following config on the VG:

voice service voip

allow-connections h323 to h323

allow-connections h323 to sip

fax protocol t38 ls-redundancy 2 hs-redundancy 0 fallback none

h323

session transport udp

modem passthrough nse codec g711ulaw

On Dial-peer

Fax rate disable

Thanks in advance.

[Stoyan Stoitsev]

Hello,

Try these things:

1. Set your fax machine send/receive speed to 14400 or 9600 bps.

2. Make sure that you have set a clock source in your voice GW:

network-clock-participate wic 0

network-clock-select 1 E1 0/0/0

BR,

Stoyan

[Bejesh Kumar V]

I have the same issue with receiving internal fax. I am able to receive external fax.