Question: In an IMS (IP Multimedia Subsystem) network supporting business trunking for IP-PBXs (Internet Protocol - Private Branch Exchange), which of the following statements accurately describes the key difference between Registration mode and Static mode?
Option 1: The primary difference lies in how subscriber provisioning is handled in the HSS (Home Subscriber Server).
Option 2: The main distinction is in the type of services offered to the IP-PBX by the IMS network.
Option 3: The difference is in the specific technical support provided for each mode.
Option 4: In Registration mode, the IP-PBX performs registration procedures with the IMS network, whereas in Static mode, it does not perform any registration procedures.
Explanation: This question requires understanding of the nuances between Registration and Static modes in the context of IMS network support for business trunking. The correct answer highlights the fundamental difference between these two modes: the presence or absence of IP-PBX registration procedures with the IMS network, impacting how services are delivered to and utilized by IP-PBXs.