GazelleTel Components

The GazelleTel network consists of multiple redundant server clusters hosted in Atlanta, Dallas, Las Vegas, and New Jersey. All of our servers operate in an Active-Active configuration, which means that the service is available from the primary or backup cluster at any time. A further level of redundancy is achieved by using High-Availability (HA) Pairs. In the event of a hardware or software error, the HA spare server will assume the IP address of the server with a problem and assume its operations transparently.

SIP Servers and failover

Your phones and/or SIP Trunks REGISTER to their Primary server (as defined by the SRV records the client domain is assigned to). Other PBX servers keep track of the active registration, if they receive a call for a device registered at a different Geo Location, they will always direct the call to the node where the phone is registered. In the case of a failover event, the phone registers to the backup server until the primary server is once again reachable.

Behind the scenes, there are many other SIP Servers at work, such as ENUM Gateways and Ingress/Egress Proxies. These are largely hidden from your view, and for security we do not expose the inner workings of our Network. However, you will be better able to understand SIP Call traces if you are aware of the other elements that fit into a given call flow. The diagrams below show the typical call paths taken for Inbound and Outbound calls from a registered SIP device.

Simplified Network Topology