VoIP Phones Using Windows DNS Server via IPSEC

[WildMonkey365]

I have a multi site location and The phones are using a Windows DNS server at the company's main location. Generally speaking I know there is delay in the tunnels and resolution is usually slower than at the main site since it is resolving through IPsec tunnel. The phones have a Sip server FQDN that needs to be resolved for the phones to work which is being resolved over the IPSec tunnel. Will this cause delay in voice conversations?

 

[bill001g]

The control path and the voice path are only sorta related. Depends a lot on the system but there is usually a central controller that all the phones connect to. In many cases it is the controller that is doing the lookup. Still the process similar for all SIP type of calls. They phone use SIP to negotiate all the call setup things. Any delays will be in the setup. So maybe it takes a fraction of a second longer to complete the call..ie give you a ringing sound.

The voice path parameter is all send inside the sip stream as part of this call setup. All the IP port number codex etc are all decided at this point. When the voice path actually opens it is all done it will send data to the ip and port number pretty much without any more communication. So once the session is open nothing really matters as long as the 2 stations have a path.