Chapter 18 Maintenance and Troubleshooting
Resolving problems
SmartClass TPS User’s Guide
152 22035456, Rev 001 June 2014
Make sure that the VPI and VCI is correct.
Make sure that the encapsulation is correct.
Try pinging a different host.
Make sure the DNS server is active with another PC.
Set the ping packet size smaller.
Make sure the Data mode is set correctly for the type of circuit under test (such as PPPoE versus
IPoE).
Make sure you are not behind a firewall; they can block ping responses from reaching the host.
Check to see if the connection is unnumbered. If it is, verify that the connection is configured
correctly.
View the IP Ping results menu. It can often give important clues as to why the ping is not successful.
VoIP test problems
The following section addresses questions about VoIP testing.
Issue
The VoIP call didn’t go through.
Resolution
Check your connections to verify that they are hooked up properly.
Check the status LEDs. The Sync and Frame LEDs should be green.
Verify the LAN settings (IP address, netmask, DNS name).
Verify the call control. Most equipment uses Fast Connect.
If you do not have a gatekeeper, verify the outgoing alias and IP address.
If you are using a gatekeeper, verify you are registered with the gatekeeper.
If you are on an IPoE line and STUN is enabled, the data layer will not come up until the STUN client
on the SmartClass has determined the type of NAT used between the SmartClass and the STUN
server. Wait a few minutes and try to resync.
Check with your system administrator to verify that the firewall allows VoIP traffic.
Issue
I am emulating a SIP phone but cannot register with the SIP server.
Resolution
In typical networks, the same server handles both registration and placing and receiving calls.
However, in some networks, there is a Proxy server that handles SIP messaging for placing and
receiving calls, and a registrar that handles registration, which may be in a different domain.
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