[cisco-voip] Fwd: Cisco ATA Fax Confusion

[Ryan Ratliff]

The fax section of the CUCM SRND is a very good resource for this.

The ATAs appear to support modem passthrough for fax only.

"T.38 fax relay is supported on most of the current Cisco voice gateways, especially those running Cisco IOS. Notable exceptions are the Cisco Analog Telephone Adaptors (ATAs) and legacy products such as the Cisco 6608, 6624, and DT-24/DE-30+.

Most Cisco voice gateways support Cisco fax relay, and it is the default fax transport method. Notable exceptions with regard to the support of Cisco fax relay are the Cisco AS5350 and AS5400 with Nextport DSP cards, the Cisco ATA, and the Cisco DT-24/DE-30+. Another exception is that the Cisco 2900 and 3900 Series gateways with the PVDM3 DSPs do not support Cisco fax relay.

Unlike T.38 fax relay, which uses an Unnumbered Datagram Protocol Transport Layer (UDPTL) header, Cisco fax relay utilizes the standard RTP header, which makes Cisco fax relay capable of secure fax transactions using Secure Real-Time Transport Protocol (SRTP).

Modem passthrough is supported by all current Cisco voice gateways, including the Cisco ATA as well as most legacy voice gateways."

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/gateways.html#wp1046809

-Ryan

On Jan 22, 2010, at 10:08 AM, Rhodium wrote:

Hi All, Nick and Venkata,

Thanks for the feedback but do you have the issue of not being able train the faxes or missed pages?

I am still after an answer to my question about what fax protocol is actually supported on the ATAs and on the VG in SCCP mode as my theory does not relate to real life?

Regards,

Jason




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