I have figured out the problem. First of all, as noted everywhere in the literature, the correct port to use for registration and proxy settings is 5061 for CHAN SIP. The phone itself listens on 5060 and that doesn't seem to be easy to change, nor do I want to. However, the big discovery was that Simple Setup in Polycom's VVX310 was not sufficient to perform registration because another setting under Settings->Lines[Authentication] had a radio button setting 'Use Login Credentials' which was enabled. So, all that userid and password stuff I was setting in the Authentication fields was being ignored because the phone was using my device login credentials to register which had nothing to do with my extension login in FreePBX. Tell the world!
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