Locating the SIP servers
Similar to e-mail servers, you will need to specify which server would serve a specific domain. The location of the SIP servers is described in RFC 3263. The first objective of location is to determine the IP, port, and transport protocol for the server based on the domain name. The second objective is to determine the address of a backup for the first proxy.
To perform these objectives, we will use a Domain Name System, more specifically, Name Authority Pointer (NAPTR) and Service (SRV) records. NAPTR records are employed to determine the transport protocol. To specify a transport protocol, you should insert the DNS records in the zone file of your DNS server. (Check the documentation of your DNS server on how to do it.) ...
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