I was among those who were having hang problems in the thread. However, not for some time now since I split my network configuration.
One concensus was that DNS resolution may be an issue. Some people got around the issue by inputing proxy IP address rather than proxy name (if you know fixed IP of proxy).
Some people resolved issue by upgrading to the now latest firmware version.
In my case, my SPA504G was initially behind two NAT's. When I split my network (using 5-port switch) such that my SPA2102 and SPA504 were on separate WAN IP from my WRT54G and PC, then I did't have any more lock-ups (my ISP allows me 2 WAN dynamic IP addresses).
So, there seems to be various reasons contributing to the lockups, depending on ones network configuration, firmware, etc.
I've been able to replicate this issue. When transferring a call (made internally) to another internal extension, the phone freezes before it ever dials the new party. This ONLY happens when using the LDAP directory to find the user's extension. Dialling the number by hand works as expected.
SPA 303, fw 7.4.8.a
Server 2008 R2 AD
The SIP Proxy was specified by IP, not hostname
The config for the LDAP search was calling on the LDAP server by DNS name - trying to change this to IP address broke the LDAP Lookup however, so this theory can't be tested.
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