TR 23.850 ★
Study on
Roaming Architecture
for Voice over IMS
with Local Breakout

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V11.0.0 (Wzip) 2011/12 40 p.

essential Table of Contents for TR 23.850 Word version: 11.0.0

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2 References Word‑p. 6

3 Definitions, symbols and abbreviations Word‑p. 7

4 Requirements Word‑p. 7

4.1 Service control requirements Word‑p. 7

4.2 VPLMN requirements Word‑p. 7

4.3 SRVCC requirements Word‑p. 8

4.4 Media plane considerations Word‑p. 8

4.5 Charging Records considerations Word‑p. 8

4A Reference Architecture Word‑p. 9

5 Solutions Alternatives for Originating Sessions Word‑p. 9

5.1 CS Copy Cat model based on V-CSCF Word‑p. 9

5.2 Transit routing via VPLMN Word‑p. 18

5.3 Transit function in the visited network Word‑p. 22

5.4 IMS home routing Word‑p. 28

5A Solutions Alternatives for Terminating Sessions Word‑p. 30

6 Alternatives Assessment and Conclusions Word‑p. 30

A CS voice Charging and interconnection principle - high level description Word‑p. 33

A.1 General Business Logic Word‑p. 33

A.2 Payment flows Word‑p. 34

A.3 Accounting principles Word‑p. 35

B Recommendations for the Convergent Interconnection Word‑p. 39

$ Change history Word‑p. 40