Talkswitch 24-CA, 48-CA/CVA manual How often will my public IP address change?

When you first set up your VoIP device (TalkSwitch 48-CVA unit, gateway or phone), it will register itself with the TalkSwitch 48-CVA that is configured as the IP server so that calls can be directed to your location.

When you initiate a VoIP call, your device (TalkSwitch 48-CVA unit, gateway or phone) will contact the TalkSwitch 48-CVA that is configured as the IP server to obtain the contact information for the destination you are trying to reach. Once the information is received, the call is established directly between your location and the destination. The IP server is no longer involved in

the call.

If the location of the IP proxy and registrar has a dynamic IP address, you have to use the dynamic DNS since the IP server location becomes unreachable as soon as the IP address changes.

What is Dynamic DNS?

Dynamic DNS is a Domain Name Service used with dynamic IP addresses. DNS is used to allow devices to find other devices on the Internet by name rather than by IP address. Dynamic DNS allows you to use a Fully Qualified Domain Name (FQDN) to locate a device with a dynamic IP address. The FQDN does not change. There are companies on the Internet who can provide you with a DNS address, even if your IP address changes. Such companies are www.dyndns.org, hn.org or www.no-ip.com. Please consult with them how to use their service. The basic idea is that you will receive an address like myname.homeip.net which points to your IP address (i.e. 209.210.230.140). This is important for locations where the IP server resides and where the public IP address is dynamic. All other locations will point to this IP server’s domain instead of an IP address.

What is the drawback of using dynamic DNS?

When DNS records are updated, they have to be sent all over the world so that everyone will be aware of the changes. Basically, one DNS server connects to another and swaps information. In many cases, the DNS servers are updated very quickly. Updates should not take longer than 15 minutes to propagate throughout the DNS system. It is possible that propagation could take longer due to unforeseen traffic but it shouldn’t take much more than an hour at the most.

How often will my public IP address change?

This depends on the policies of your Internet Service Provider (ISP, the company that provides your Internet access). It can be a matter of days, weeks or even months before your IP address changes. A power loss or reboot to your cable or DSL modem usually results in the assignment of a new IP address.

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