Fax Machine - FXS Port issue

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May 12th, 2008
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Dear All

I have H.323 VG router, i have FXS port which a FAX machine is connected to, i configured the required dial-peer. and i can send fax. but the problem is i can not receive. i have this issue, i dont know if it is efecting. when i conenct analog phone on the FXS port, and when i am calling this phone from my mobile, i am not hearing ring back tone !! although the analoge phone is ringing. when the phone is picked up, the communication will establish clearly, so is it effecting the fax problem. i think some thing should be done on my E1 line.

waiting for you guys


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Overall Rating: 5 (1 ratings)
paolo bevilacqua Mon, 05/12/2008 - 08:34
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Which protocol are you running on the E1?

Also check "show controllers E1" for slips and if any configure networck-clock-participate and -select.

Hope this helps, please rate post if it does!

d.haeni Thu, 05/15/2008 - 07:19
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Hi, I had the same thing regarding ringback for incoming calls:

It would work when calling from a fixed line, but not from my mobile

Once I have configured "voice call send-alert", ringback worked also for mobile calls.

HTH (at least for the ringback portion of your problem)


c.yeo Fri, 05/16/2008 - 08:42
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We had a similar problem with our VG224 gateways. When we updated the IOS to version 12.4(15)T1 the problems went away.

Chuan Liu Thu, 05/22/2008 - 23:40
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Thank David,

I was having the ringback problem, and it is gone after I configured "voice call send-alert".


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