![]() ![]() The client would have assumed internal connectivity with the first A record and external connectivity with the last two A records. When this failed we looked for SIP, then SIPEXTERNAL. The next A record we look for is SIPINTERNAL followed by the right hand side of the symbol. ![]() When those fail we will fall back to searching for A records and making assumptions about port numbers. If those succeed we get a host name and a service port for our connection. The DNS query is constructed by the client by taking _sipinternaltls._tcp and then adding whatever is to the right hand side of the symbol in the user sign in dialog box. This is important because this lets the client machine know whether it is logged in internally or externally. The first SRV record would be for internal client logins and the second one is for external (i.e. First, we see that the first two queries are for SRV (service locator) records. If we look at these DNS queries we notice a few things. I wanted to show how the Lync client automatically finds its servers for logon purposes. Of course these failed as I have not done any of the DNS records for automatic client login support in my sandbox lab yet. So the client tried to query DNS for _sipinternaltls._tcp., _sip._tls., sipinternal., sip. ![]()
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