It appears to be a security problem on our SIP providers end. We did a long running packet capture in between the UC320 and the provider IAD.
Immediately preceding this issue we found:
INVITE sip:firstname.lastname@example.org, with session description
INVITE sip:email@example.com, with session description
INVITE sip:firstname.lastname@example.org, with session description
There were many calls in a row like this -- it appears to be attempted toll fraud.
The UC320 appears to accept the first 12 calls, then spits back "182 Queued" to all the rest that come in.
Because we had the AA setup to "Return to Main Menu" on timeout (instead of endcall) and the person sending these bogus requests was not sending "BYE"'s, the calls got hung, and any further calls got "Queued".
We are going to work with the provider on this... but it sure would be really nice if you could setup a UC320 to reject any calls to DIDs not defined in the incoming dial plan.
Thank you for the update on this outstanding item.
One question, was the source IP address of the inbound calls from your SIP provider? The UC320W does block inbound calls from IP addresses that are not registered via the configured SIP trunk. (There are some corner cases where we generated some PMF's to allow inbound calls on multiple IP's).
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