Since my experience is limited in the VoIP field, my question is if this solution has any side-effects which one should be concerned about. If its relevant, we also have fax calls across these Voice Gateways. No other PBX is connected.
Here is some of the cofiguration that might be relevant:
Re: Changing input gain and output attenuation on Voice Port
I thought you might have a problem with the E1 config that was causing the problem, but it looks good. Adjusting the ouput attenuation as described in the link in your original post should not present any other problems. Start with the value indicated in the link and adjust as needed.
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