README.md: More hyperlinks and add more interfaces / features

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 osmo-msc - Osmocom MSC Implementation
 =====================================
 
-This repository contains a C-language implementation of a GSM Mobile Switching
-Centre (MSC) for 2G (GSM) and 3G (UMTS).  It is part of the
+This repository contains a C-language implementation of a GSM **Mobile Switching
+Centre (MSC)** for 2G (GSM) and 3G (UMTS).  It is part of the
 [Osmocom](https://osmocom.org/) Open Source Mobile Communications
 project.
 
 OsmoMSC exposes
- * A over IP towards BSCs (e.g. OsmoBSC): 3GPP AoIP or SCCPlite
- * IuCS over IP towards RNCs / HNBGW (e.g. osmo-hnbgw)
- * The Osmocom typical telnet VTY and CTRL interfaces.
- * The Osmocom typical statsd exporter.
+
+ * *A over IP* towards BSCs (e.g. [osmo-bsc](https://osmocom.org/projects/osmobsc/wiki): 3GPP AoIP or SCCPlite
+ * *IuCS over IP* towards RNCs / HNBGW (e.g. [osmo-hnbgw](https://osmocom.org/projects/osmohnbgw/wiki))
+ * *MGCP* towards a co-located [osmo-mgw](https://osmocom.org/projects/osmo-mgw/wiki) for the RTP streams
+ * *[GSUP](https://osmocom.org/projects/cellular-infrastructure/wiki/GSUP)* (instead of 3GPP MAP) towards [osmo-hlr](https://osmocom.org/projects/osmo-hlr/wiki)
+ * *SMPP* towards any external SMS sending/receiving applications
+ * *[MNCC](https://osmocom.org/projects/osmomsc/wiki/MNCC)* as external call-control interface towards e.g.
+   [osmo-sip-connectr](https://osmocom.org/projects/osmo-sip-conector/wiki)
+ * The Osmocom typical telnet *VTY* and *CTRL* interfaces.
+ * The Osmocom typical *statsd* exporter.
 
 OsmoMSC implements
+
  * mobility management
  * call control (either via built-in MNCC handler or external osmo-sip-connector)
+ * voice group call ([VGCS](https://osmocom.org/projects/cellular-infrastructure/wiki/Voice_Group_Call)) and
+   voice broadcast calls ([VBS](https://osmocom.org/projects/cellular-infrastructure/wiki/Voice_Broadcast_Call)) as used in GSM-R
  * USSD (exposed via GSUP)
  * SMS (either via built-in SMSC or external via GSUP)
 
 Homepage
 --------
 
-You can find the OsmoMSC issue tracker and wiki online at
-<https://osmocom.org/projects/osmomsc> and <https://osmocom.org/projects/osmomsc/wiki>.
+You can find the OsmoMSC home page and wiki online at
+<https://osmocom.org/projects/osmomsc/wiki>.
 
 
 GIT Repository
@@ -76,10 +85,10 @@
 History
 -------
 
-OsmoMSC originated from the OsmoNITB project, which started as a minimalistic
-all-in-one implementation of the GSM Network. In 2017, OsmoNITB had reached
-maturity and diversity (including M3UA SIGTRAN and 3G support in the form of
-IuCS and IuPS interfaces) that naturally lead to a separation of the all-in-one
-approach to fully independent separate programs as in typical GSM networks.
+OsmoMSC originated from the [OsmoNITB](https://osmocom.org/projects/osmonitb/wiki/OsmoNITB)
+project, which started as a minimalistic all-in-one implementation of the GSM Network. In 2017, OsmoNITB had
+reached maturity and diversity (including M3UA SIGTRAN and 3G support in the form of IuCS and IuPS interfaces)
+that naturally lead to a separation of the all-in-one approach to fully independent separate programs as in
+typical GSM networks.
 
 OsmoMSC was one of the parts split off from the old openbsc.git.

