For each configured H.323 or SIP extension, IP Office requests from the WebLM server an Avaya or third-party IP endpoint license, as per the Reserve License field of the configured extension record. When IP Office uses WebLM licensing, the Reserve License field for each configured H.323 and SIP extension is by default set to Avaya IP endpoint license. This field is editable and the administrator can change it to a third-party IP endpoint license or to both Avaya and third-party IP endpoints.