01_hello_world v1

content/01_hello_world.adoc

 = Hello World OpenIMSd
 
-:date: 2024-10-04 01:23
+:date: 2025-03-02 01:23
 :tags: blog
 :category: blog
 :slug: 01-hello-world
 :authors: Alexander 'lynxis' Couzens <lynxis@fe80.eu>
-:summary: Hello world, an introduction to OpenIMSd
+:summary: An introduction to OpenIMSd
 
 Current free mobile phone OS (like postmarket OS, ...) only support voice calls
 for 2G and 3G on Qualcomm based devices.
 Calls via 4G using VoLTE are not supported (*except CSFB, which redirects to 2G/3G)
-because the modems require a lot of addional configuration.
+because the modems require a lot of addional configuration and complexity.
 
-We will document the relevant APIs and add support to libqmi in the near future.
+Our goal is to support VoLTE on Qualcomm based phones.
+
+We will document the relevant APIs and add support to libqmi.
 Further we will implement a IMS configuration daemon which will communicate with
 the baseband using QMI (Qualcomm MSM interface) to configure the relevant services
 to allow the usual apis to function.
 
-..todo:: What we want to archive?
-
-..todo:: What is our focus?
+We choose Qualcomm based Android phones, because they are the commonly used phones and
+widely available. Also Qualcomm baseband has received a lot of reasearch (and reverse engeering)
+over the years and a lot of knowledge has been collected in the open.
 
-..todo:: How do we want to start?
+Our implementation will heavily use the baseband in the same way as Android is use the baseband service,
+because this way it is possible to allow handover between 2G and VoLTE.