Modem Connection via ATA 186/188 failing

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Nov 30th, 2007
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Problem: Modem Connection Via ATA failing

Environment Details:

1) Using a Symbol SPT1800 Docked in a Symbol Cradle (Model # CRD1700-1000M-1)

2) ATA 186/188 running Firmware ATA030203SCCP051201A.zup.

3) Call Manager Version 4.1(3)sr4d

Cannot get a connection with Symbol SPT1800 Docked in the Cradle and attached to ATA186 or ATA188 to the device on the other end. Unit dials fine and tries to establish a handshake with the device on the other end but is never successful. Modem handshake tones sound funny/not normal.

All works fine and sounds normal with the same Symbol SPT1800 and Cradle when connected to POTS line from telephone company.

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dezoconnor Sat, 12/01/2007 - 02:46
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ATA's don't support Modem's and Super G3 faxes. Your best bet would be to install an FXS card into your voice gateway.

c.walsh Thu, 12/20/2007 - 09:43
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What config would be required for this to work on the GW ?



Stoyan Stoitsev Sun, 12/02/2007 - 05:10
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Check this info:

Fax Services

The Cisco ATA supports two modes of fax services, in which fax signals are transmitted using the G.711


• Fax pass-through mode-Receiver-side Called Station Identification (CED) tone detection with

automatic G.711A-law or G.711μ-law switching.

• Fax mode-The Cisco ATA is configured as a G.711-only device.

From this great doc:

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for SCCP (version 3.0)

[Edit] What I forgot to mention is that it's basically the same if you are using a fax or a modem. Try setting it for Fax mode, i.e. G.711-only device so there will be no manipulation of the tones the modem (or fax) sends. Also set your modem for 9600 bps.




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