Download Voice Over LTE: VoLTE by Miikka Poikselka, Harri Holma, Jukka Hongisto, Juha Kallio, PDF
By Miikka Poikselka, Harri Holma, Jukka Hongisto, Juha Kallio, Antti Toskala(auth.)
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IMS entry point in the home network means that the visited network would not anymore be aware of voice calls and short messages which would lead to smaller roaming revenues for communication service providers. • Fulﬁlling regulatory requirements would be challenging or impossible. – IMS signalling trafﬁc is expected to be encrypted by Internet protocol security (IPSec). This means that the visited communication service provider cannot properly perform a lawful interception. – IMS emergency session handling requires the use of proxy call session control function (P-CSCF) in the visited network.
The main task of E-CSCF is to select an emergency centre also known as a public safety answering point (PSAP) where an emergency request should be delivered. g. police, coast guard). Once the appropriate emergency centre is selected the E-CSCF routes the request to the emergency centre. 2 Service Functions Four functions in this book are categorised as IMS service-related functions – namely MRFC, MRFP, MRB and AS. 18 shows how service functions are connected to each other and other IMS entities.
At the time of writing it can be said these standardised IMS applications have not taken off commercially in the beginning of 2011. However, Release 6 set the baseline for IMS based service suite which is today known as rich communication suite. In mobile world congress 2011, ﬁve big communication service providers shared their plans for launching commercially enhanced rich communication suite. While 3GPP has ﬁnalised its Release 5 and 6, other standardisation development organisations have done parallel developments to deﬁne their IMS variants which was a testimony of the growing interest in IMS.