Check the power/cord
Check/replace network cable
If the audio is very loud then it may be overloading the CODEC or Echo Can.
I can't remember if you can control the volume level but if you can turn it
down (-6db)and try again.
Set the FXO ports to 600 ohms & 2.15 uf
Set-up asterisk to answer after 2 or 3 sec delay (one or two rings)
If you have this set up as a SIP trunk then make sure dtmf signaling is default
to RFC2833 and codec is PCMU (only) If this doesn't work then it may need
replacing.
=================================
Henry L.Coleman [www.VoIP-PBX.ca]
Tel: 647-723-5160 Ext.203
=================================
{ Doug Geary}
> New implementation, 3 POTS lines into a Grandstream GXW4104, about 20%
> of the time, when the IVR picks up, the caller hears a "Bzzzzzt" and
> then the IVR starts. It could be on any channel. The rest of the time,
> all is normal. We've tested the lines, polarity is correct, and the
> lines appear clean. Asterisk looks normal. This appears to be coming
> from the Grandstream. Any ideas what's going on here?
>
> Thanks,
>
> Doug
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