If you have files in the following directory named something like the following, then what worked for me on dialup on my sl5500 may work for you. Remember I'm on a Sharp ROM, and I don't know if the syntax or file location may be different for others.
/home/root/Applications/Network/modules/DialUp20.conf
This seems to be a Qtopia Desktop entry, telling the Z what to do.
One of the lines is the connect delay to allow before responding to my modem, and setting it too high was resulting in timeouts for my modem as Z wasn't responding fast enough. I changed the number from something high like the following:
connectdelay = 120000
to the following using vi:
connectdelay = 8000
I would NOT add the above to a file if it isn't already there...'cause if it ain't there, your software isn't set to recognize it. I would just tweak it if your file has a line that looks like the above.
If you use the built in GUI connection wizard, it will reset to original values, and I do not know what those are any more. I had thought a long connect delay was best, and that was totally wrong.
Again, I don't know if this will correlate with your Audiovox issue, but if the machines can't sync with each other smoothly, one of them will give up.
If you are using Qtopia to perform the connection, then this will be relevant. Otherwise, I don't know where or how that connect delay would be coded into the actual kernel files.
sdjf
EDIT: found it, in my /etc/ppp/peers/filename12346
the line reads:
connect-delay 8000
I don't see a line like that in yours...hmmm