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16-28
Cisco ASA Series Firewall CLI Configuration Guide
Chapter 16 Configuring the Cisco Phone Proxy
Troubleshooting the Phone Proxy
Configuring Your Router
Your firewall/router needs to be configured to forward a range of UDP ports to the IP phone. This will
allow the IP phone to receive audio when you make/receive calls.
Note Different Cable/DSL routers have different procedures for this configuration. Furthermore most
NAT-capable routers will only allow a given port range to be forwarded to a single IP address
The configuration of each brand/model of firewall/router is different, but the task is the same. For
specific instructions for your brand and model of router, please contact the manufacturer’s website.
Linksys Routers
Step 1 From your web browser, connect to the router administrative web page. For Linksys, this is typically
something like
http://192.168.1.1.
Step 2 Click Applications & Gaming or the Port Forwarding tab (whichever is present on your router).
Step 3 Locate the table containing the port forwarding data and add an entry containing the following values:
Step 4 Click Save Settings. Port forwarding is configured.
Troubleshooting the Phone Proxy
This section includes the following topics:
• Debugging Information from the Security Appliance, page 16-28
• Debugging Information from IP Phones, page 16-32
• IP Phone Registration Failure, page 16-33
• Media Termination Address Errors, page 16-41
• Audio Problems with IP Phones, page 16-42
• Saving SAST Keys, page 16-42
Debugging Information from the Security Appliance
This section describes how to use the debug, capture, and show commands to obtain debugging
information for the phone proxy. See the command reference for detailed information about the syntax
for these commands.
Table 16-4 lists the debug commands to use with the phone proxy.
Table 16-3 Port Forwarding Values to Add to Router
Application Start End Protocol IP Address Enabled
IP phone 1024 65535 UDP Phone IP address Checked
TFTP 69 69 UDP Phone IP address Checked