Busy blog day! :)
Today on TechNet, Dr. Rez, another article was published written by myself around configuring IntelePeer SIP trunks with Lync Server 2010. The article is very similar to the OCS articles written last year but of course focuses on Lync Server.
Lync Server 2010 does a great job of connecting Internet SIP trunks directly especially if a Cisco ASA is involved (the 5505 is an amazing appliance). Check out the article from either my home web site or directly on TechNet here.