I have xp pro sp1.
I am able to have someone else provide Remote Assistance to me. I cannot provide Remote assistance to a client.
I also have Vonage with two units, daisy chained.
I get the following message
Remote Assistance connection could not be established because the remote host name could not be resolved. Please try again.
Essentially it just means that remote assistance didn't get a response from the target computer. The most likely cause in home scenarios is that there's a router in the way at the remote site. For Remote assistance to work, port 3389 must be forwarded on that router
port 3389 is open
<?xml version="1.0" encoding="Unicode" ?><UPLOADINFO TYPE="Escalated"><UPLOADDA
8=" RCTICKETENCRYPTED="0" DtStart="1143506631" DtLength="30" PassStub="" L="0" /></UPLOADINFO>