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| TSG-X: Core Networks |
| Working Group 1 |
Evolution, Requirements, and Architecture (ERA) |
| Working Group 2 |
Circuit Switched Network (CSN) |
| Working Group 2.2 |
Billing, Accounting, and Numbering (BAN) |
| Working Group 3 |
Multimedia Domain (MMD) |
| Working Group 4 |
Project Management Team (PMT) |
| Working Group 5 |
Packet Data Service (PDS) |
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