The document summarizes the simplified call flow signaling process for a 2G/3G voice call. It shows that UE1 establishes a connection with the access network and core network to page UE2. UE2 responds and a connection is established between the two user equipments through the core network, with a notification that they are now connected.

1. Simplified Call Flow Signaling:
2G/3G Voice Call
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2. 2G/3G/4G Network Architecture
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BSC
BTS
MSC
Voice (PSTN)
Network
SGSN
Data (IP)
Network
RNC
Node BeNodeB
MME
GGSN
Access
Network
Core
Network
Air
Interface
MSUEUE
BSSRNS
S-GW
P-GW
2G 2.5G
3G 4G
EPC

3. ©3G4G
Mobile Network Operator 1
(MNO 1)
Public Switched Telephone Network
(PSTN)
Exchange
Exchange
Internet
Landline phone
Wi-Fi router
MNO 2
Core Network
Base Station
Base Station
Access NetworkBackhaul
Air Interface

4. 2G/3G Voice Call Signalling
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UE1 AN CS CN PS CN
Establish connection procedures
Paging UE2. Please respond
UE2
I want to Setup connection with UE 2
Ok. Call Proceeding
Call for UE2
Establish connection procedures
UE1 wants to establish connection with you
Ok, establishing connection
Connected
Connected

5. Thank You
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