After installing the CoMo for Nokia client, the first thing you need to do to successfully sign-in is to get the configuration settings fields correct in the settings dialog. We've received a number of questions on what value should be used for the “Server URL” configuration field. Many people do not know what to enter for this field or make the mistake of using the FQDN (fully qualified domain name) or IP address of Microsoft Office Communications Server 2007 R2 (OCS) Access Edge Server. For example, https://sipalt.access.contoso.com:443 where 443 is the port used for remote user access. Before we hand you the answer, let us briefly walk you through the topology that will be used for the CoMo for Nokia client to connect to the OCS environment. CoMo for Nokia is not a direct Session Initiation Protocol (SIP) endpoint like other supported OCS end points such as Microsoft Office Communicator, Microsoft Office Communicator Phone Edition and Microsoft Office Communicator for