Cisco SPA501G Administration Guide - Page 129
Debug Level, SIP Debug Option, Voice, STUN Test Enable, Submit All Changes
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Configuring SIP, SPCP, and NAT Managing NAT Transversal with Cisco IP Phones 4 The address and port number must be reachable from the Cisco IP phone. The port number appears on the output log file name. The default output file is syslog.514.log (if port number was not specified). STEP 4 Set the Debug Level to 3. STEP 5 To capture SIP signaling messages, click the Ext tab and navigate to SIP Settings. Set the SIP Debug Option to Full. STEP 6 To collect information about what type of NAT your router uses click the SIP tab and navigate to NAT Support Parameters. STEP 7 Click Voice > SIP and navigate to NAT Support Parameters. STEP 8 Set STUN Test Enable to yes. STEP 9 Determine the type of NAT by viewing the debug messages in the log file. If the messages indicate that the device is using symmetric NAT, you cannot use STUN. STEP 10 Click Submit All Changes. Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 128