This should workaround Clearwire blocking port 5060.
After having a frustrating experience setting up VOIP with Clearwire and discovering that Clearwire blocks 5060.
I came up with this workaround.
1. I had my VIOP service provider alias port 5060 to port 5040.
2. Then I set both the inbound and out bound proxy of my sipura spa 2100 like this: foo.bar.com:5040
After that everything worked.
If you have any questions email me l82CRE8@yahoo.com