Beta Draft Confidential
16-121/19/05 ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
About SVCs
About Address Translation
About Address Translation
This section describes how address translation occurs in various situations and at
various points along a network connection. This information applies only if you
enable address translation. Also, egress address translation requires matching a called
party address to a configured prefix on the egress port.
Calling party and called party addresses are stored as information elements in the
SETUP message, which is sent to initiate call setup. In some situations, calling party
and called party sub-addresses are also stored as information elements in the SETUP
message.
Egress address translation, when enabled on a network-to-network port, functions as
described in Table 16-7 and Table 16-8. The following factors determine how address
translation occurs:
• Whether or not local and/or remote gateway addresses are defined on the egress
port
• The type of translation (tunnel or replace) selected as the egress address
translation mode
• The numbering plan of the signaled calling and called addresses
Calling party and called party processing are independent. Note that in the SETUP
message, the called party address is mandatory, while the calling party address is
optional. In the case of a native E.164 called party or calling party address, the related
sub-address field is always set to null, since the sub-address field cannot carry native
E.164 addresses (note that in the tables, if the signaled calling party address is native
E.164 format, the calling party sub-address field is always set to null).
Table 16-6. SETUP Message Information Elements
Calling Party
Address
Called Party
Address
Calling Party
Sub-address
Called Party
Sub-address
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