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ATA187 and Modem

I have a remote site that the only telephone option is over the VoIP system.

Currently, an ATA 187 is there, configured for two lines. Line 1 is setup for an analog phone- it works just fine.

Line 2 is to be used with a Cambell Scientific modem (9600). It will not work with the modem.

It picks up and tries to connect, but will never finish.

 

Any ideas?

 

Mark

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Update.

 I changed the ATA to use Fax Passthrough. The modem will connect, but drops after about 30-45 seconds.

 

I also have had some ATA 187s have noisy analog outputs. changing the setting to 600 Ohms real (rather than the default) seems to solve that. I'll try it on the modem.