R E V I E W D R A F T # 1 — C I S C O C O N F I D E N T I A L
2-2
Cisco WRP500 Administration Guide
Chapter 2 Configure Your System for ITSP Interoperability
Configure NAT Mapping
Step 3
In the
NAT Support Parameters
section, enter the following settings:
•
Handle VIA received, Insert VIA received, Substitute VIA Addr:
Choose
yes
.
•
Handle VIA rport, Insert VIA rport, Send Resp To Src Port:
Choose
yes
.
•
EXT IP:
Enter the public IP address that was assigned by your ISP.
Voice tab > SIP: NAT Support Parameters
Step 4
Under the
Voice
menu, click
Line 1
or
Line 2
to choose the line interface that you want to modify.
Step 5
In the
NAT Settings
section, enter the following settings:
•
NAT Mapping Enable:
Choose
yes
.
•
NAT Keep Alive Enable:
Choose
yes
.
Voice tab > Line N > NAT Settings
Step 6
Click
Save Settings
.
Note
You also need to configure the firewall settings on your router to allow SIP traffic. See
.
Configure NAT Mapping with STUN
This option is considered a practice of last resort and should be used only if the other methods are
unavailable. This option can be used if the following requirements are met:
•
You have a dynamically assigned external (public) IP address from your ISP.
•
You must have a computer running STUN server software.
•
The edge device uses an asymmetric NAT mechanism. If the WRP500 is the edge device, this
requirement
is not met
. For more information, see
“Determine Whether the Router Uses Symmetric
.
•
If the WRP500 is connected to an Ethernet switch, the switch must be configured to enable Spanning
Tree Protocol and Port Fast on the port to which the WRP500 is connected.
Note
Use NAT mapping only if the ITSP network does not provide a Session Border Controller functionality.
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