ITUSS7 link(1)

China ISTP

CTA Softswitch PlatformLAX POP

CTA SS1bCTA TG/SG

US Local Customers

GW

US Local Customers

GW

CTA Softswitch Platform SS7 Signalling Network Diagram

China

USA

Note:

1. The SS7 links are marked in red .

2. CTA TG/SG needs one ITUSS7 point code (1) linking to China ; and one ANSISS7 point code (2) facing to domestic U.S. Customers.

3. CTA SS1b needs one ITUSS7 point code (2) and one ANSISS7 (2) point code for internal configuration;

ITUSS7(2) Point Code

US Local Customers

GW

ANSISS7(1)

ANSISS7(2) Point Code

Local VendorsExchange

Local Vendors

GW

Node 3

CTA IGW2 LAX POP

CTIGW CT

Local ExchangeUS Local Vendors Network

CTA Platform2 Network

CT Network in China

ANSISS7 link(for ANSI41) (3)

ITUSS7 link(4)

ANSISS7 link (for ANSI41)(4) ITUSS7 link(3)

CTA Platform(2) SS7 Signalling Network Diagram

Note:

1. The SS7 links are marked in red;

2. Two ANSISS7 point codes (3) (4) are needed to connect to domestic U.S. vendors;3. Two ITUSS7 point codes (3) (4) are needed to connect CT network in China.

Node 1

Node 2