1.1. Virtual Domains 1.2. Domain-level Configuration Attributes 1.3. Caching Domain module, as the name suggests, implements support for multiple independent virtual domains hosted on one SIP server. This is often useful if you have multiple domain names and you want to make them all work and appear as one. Alternatively you might find the module useful if you want to run a shared SIP service for multiple independent customers. The module stores all supported domains and associated configuration in a database table. Most of the information can be cached in memory for performance reasons. 1.1. Virtual Domains The domain module adds support for so-called virtual domains. A virtual domain is just a collection of domain names and associated configuration information identified by a unique identifier. We refer to the domain identifier as DID elsewhere in the documentation. DID stands for "Domain IDentifier". In traditional POST world the term DID has a different meaning though. Please be aware that this is just pure coincidence. All domain names that belong to one virtual domain are interchangeable. From SIP server's perspective there is no difference between them. They can be used in SIP URIs interchangeably and the behavior of the SIP server will not be affected. This is called "domain name normalization" and it is one of the steps performed early during SIP message processing. The DID identifier can be anything. To the SIP server DIDs are just opaque strings and what format you
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