Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Inbound fax fails, ATA h323

CM 5.1, 2851 router at remote location using analog lines connected to an EVM module configured as a h323 gateway. Port 2/0/21 is a fax line. Remote building has an ATA connected to the fax machine and is using port 2/0/21 for their faxes.

I have the following commands:

voice service voip

fax protocol pass-through g711ulaw


h225 timeout setup 3



voice class codec 1

codec preference 1 g711ulaw

codec preference 2 g729r8

I have 2 dial-peer voice X voip and specified codec g711ulaw. Outbound faxes work fine, inbound fax do not. The fax machine answers the call but displays receiving / connecting on the display. The person sending the fax explains that it rings, they hear a faint fax noise like it is receiving and then goes away and just beeps. Can anyone help me out with this scenario?

Thanks in advance.

New Member

Re: Inbound fax fails, ATA h323

I was able to resolve the problem, I moved the gateway to a g711 device pool and added voice-class codec 1 under the voip dial-peers that point to CallManager. Tested and works fine now.