Use a
FREE SIP Account to Connect to various VoIP clients
We have been always looking for free SIP account providers and we have listed them quite a few times. Recently after visiting some of those listed, we have found that some of those accounts are not operating any more. Below are some that work and we will continue to test and list them here so you will be able to create SIP accounts free and fulfill your SIP communication needs.
See the list at http://snapvoip.blogspot.com/2009/01/free-sip-accounts-revisited.html