V34 modulation (SG3) is not correctly used in originated call.

[alessandro.trotta]

In order to reproduce this issue you have to perform a fax call from a SG3 fax (connetted to Payton) to SG3 fax (connetted to other end-point).

The call will be performed in G3 mode using V17 modulation instead of V34 in SG3.

In attached log two calls has been traced. The first one is an originated call, the second one is a terminated call.

Analyzing T30 protocol we see that receiver end point sends correctly the ANSam tone, but this is recognized as CED tone by Payton. After this the call continues in G3 using V17 modulation.

We try the same call using a SPA2102 ATA and V34 is correctly used.

[laharper]

Hello Alessandro,

The Payton ATAs do support G3 mode in the current firmware and we are developing additional support for SG3 in the next firmware version which is scheduled to be release early next year (February 2012).

We expect to have beta firmware to test before the end of the year and will provide to you for testing.

I will forward your trace to our engineering team to review.

regards,

-Lance Harper

Cisco Systems, Inc.

[alessandro.trotta]

Hi Lance,

thanks for your reply.

I have a further question: if SG3 mode is not supported by Payton ATAs, why V34 modulation is correctly used in terminated calls?

Could you provide us the list of supported modulations with relative transmission speed?

Thanks.

Alessandro

[alessandro.trotta]

Hi,

could you give us an update about this issue?

If SG3 mode is not supported by Payton ATAs, why V34 modulation is correctly used in terminated calls?

Could you provide us the list of supported modulations with relative transmission speed?

Thanks.

Alessandro

[laharper]

Hello Alessandro,

SG3 is not currently supported in Payton with T.38.

Are you using fax pass-through?

regards,

-Lance