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ims: fix typos

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Harald Welte 2021-08-13 19:57:05 +02:00
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2021/osmodevcall-ims/osmodevcall-ims.adoc
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@ -1,5 +1,5 @@
High-Level intro IMS, VoLTE, VoWFi
==================================
High-Level intro IMS, VoLTE, VoWiFi
===================================
:author: Harald Welte <laforge@gnumonks.org>
:copyright: 2021 by Harald Welte (License: CC-BY-SA)
:backend: slidy
@ -37,13 +37,13 @@ What this talk is about
== IMS and VoLTE / VoWiFi
* VoLTE is a marketing term for IMS over a LTE access network
* VoWiFi is a marketing term for IMS accesss over untrusted networks
* VoWiFi is a marketing term for IMS access over untrusted networks
** *untrusted* basically means not operated by a commercial telecom operator
== Basic IMS Core Network
* primarily a set of SIP proxies / switches (P-CSCF, I-CSCF, S-CSCF)
* subscriber configuratoin stored in HSS (like in LTE)
* subscriber configuration stored in HSS (like in LTE)
* optionally augmented by media gateways
** for interworking with PSTN / ISDN circuit switched interfaces
** for interworking with 2G/3G circuit switched domain
@ -166,7 +166,7 @@ Once ePDG is discovered, IKE Phase 1 is started to set up IPsec SA
* LTE extends this with the notion of EPS bearers and TFTs
** think of those like sub-flows within a PDP context
** you connect to one APN but have multiple concurrent EPS bearers to that APN
** each EPS bearer comes with a set of packet filter rules that determie to which bearer a given packet gets mapped. Those packet filter rules are called TFTs.
** each EPS bearer comes with a set of packet filter rules that determine to which bearer a given packet gets mapped. Those packet filter rules are called TFTs.
== IMS in VoLTE