As of April 2025, the global landscape of Voice over LTE (VoLTE) roaming agreements has expanded significantly, reflecting the industry’s shift towards all-IP voice services and decommissioning legacy 2G/3G networks. […]
VoLTE Roaming Global Coverage (2025)
How Does International Roaming Billing Work? Wholesale/Retail
When going to the Roaming topic, sometimes you hear words like Wholesale Charge and Retail Charge. So What is the difference between them? The Wholesale Charge determines how much roaming costs […]
What is VoLTE Roaming? Architecture Options and Challenges
The 3rd Generation Partnership Project (3GPP) architecture has introduced a subsystem known as the IP Multimedia Subsystem (IMS) as an addition to the Packet-Switched (PS) domain. IMS supports new, IP-based […]
What is the Roaming? How It works in 2G Network?
Recently, I received many questions and inquiries about the meaning of Roaming and some interesting questions: What is Roaming? What is the difference between National Roaming and International Roaming? First, […]
What is 5G Security Edge Protection Proxy (SEPP)?
The Security Edge Protection Proxy (SEPP) is a proxy that sits at the perimeter of the PLMN network and enables secured communication between inter-PLMN network messages. It protects the home […]