Kamailio Diameter Integration Exposed the Limits of Reusing SIP Assumptions
Kamailio felt familiar on the SIP side, but Diameter peer state and application routing forced me to treat the second protocol on its own terms.
Diameter
Tracing an IMS REGISTER Showed Me Where SIP Meets Diameter
An IMS registration capture connected familiar SIP REGISTER messages with the less visible Diameter exchanges used to select and authorize serving functions.
freeDiameter Taught Me Why a DRA Is More Than a TCP Proxy
Diameter routing depends on realms, applications and peer capabilities, so a routing agent has to understand more than destination IP addresses.
CGrates Was My First Serious Look at Rating Calls and Data Sessions
Rating made telecom architecture feel less like packet forwarding and more like a business system where usage events, balances and policy all have to agree.
Gx Charging Rules Only Made Sense After I Followed the TFT
A charging rule becomes concrete when its packet filters are followed all the way into bearer treatment.
Diameter Started Making Sense When I Followed CER and CEA First
Before looking at subscriber procedures, I needed to understand how Diameter peers identify themselves, advertise applications and establish a usable relationship.
The S6a Interface Connected LTE Authentication to the HSS for Me
Tracing S6a made the HSS feel less like a subscriber database and more like an active control-plane participant in LTE attach and mobility.