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3Com VCX V7122 SIP User Manual page 15

Voip gateway
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Typical VCX V7122/SIP Gateway Application
Figure 3
SIP
Service
Node
VCX V7122
LAN
E1/T1 PRI/
CAS
PBX - Branch A
3Com VCX V7122/SIP VoIP Gateway User Manual
PSTN
Router
LAN
LAN
IP Network
Router
Router
Telephone
E1/T1 PRI/
CAS
VCX V7122
SIP Proxy
Router
VCX V7122
LAN
E1/T1 PRI/
PBX - Branch B
CAS
15

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