Nortel Secure 4134 Configuration page 32

32 Firewall and NAT Fundamentals
Figure 3
SIP trunk side and line side
Line-side SIP traffic translation
Figure 4
MCS PC client behind firewall/NAT
SIP line side traffic refers to traffic that flows between a SIP call server
and an IP phone.
Line side traffic is triggered when the source port or destination port of the
packet is the well-known SIP port, 5060. The SIP ALG translates the private
IP address and port of the internal client in the outgoing SIP message body
Copyright © 2007, Nortel Networks
.
Nortel Secure Router 4134
Security — Configuration and Management
NN47263-600 01.02 Standard
10.0 3 August 2007