An IP group is an entity which is formed in order to be assigned further definitions. It serves for logical structuring. You can, for example, assign proxy set IDs to IP groups, i.e. define, which proxies shall be used for which group. The IP group will then register with these proxies via SIP.

With IP groups, you can furthermore define, where calls shall be forwarded to (call routing rules). Calls can e.g. be defined as destinations of PSTN calls. Rules may also be defined, which use the IP group of the call to decide the destination.