6.1 Troubleshooting
6.1.1 Installation
PROBLEM PROBABLE CAUSE SOLUTION
You cannot make/receive
calls via an IP network.
• Mother board
malfunction
• Replace the mother board (be sure to turn
off the PBX when replacing).
• Poor connection • Make sure that an 8-pin twisted pair cable is
used for connection.
• Make sure that none of the CAT 5/CAT 5e
cables in use are over 100 m (328 ft) in
length.
• Make sure that a straight cable is used for
connection to a switching hub.
• Network malfunction • Make sure that all network devices in use
are switched on.
• Make sure that there is no unwanted firewall
in the IP network.
SIP phones do not operate.
• Mother board
malfunction
• Replace the mother board (be sure to turn
off the PBX when replacing).
• SIP phone not
registered
• Register the corresponding SIP phone.
• SIP phone malfunction • Replace the SIP phone.
• Poor connection • Make sure that an 8-pin twisted pair cable is
used for connection.
• Make sure that none of the CAT 5/CAT 5e
cables in use are over 100 m (328 ft) in
length.
• Make sure that a straight cable is used for
connection to a switching hub.
• Network malfunction • Make sure that all network devices in use
are switched on.
• Make sure that the SIP phone is not
blocked by the firewall or other network
devices.
6.1 Troubleshooting
106 Getting Started
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