6.1 Troubleshooting6.1.1 InstallationPROBLEM PROBABLE CAUSE SOLUTIONYou cannot make/receivecalls via an IP network.• Mother boardmalfunction• Replace the mother board (be sure to turnoff the PBX when replacing).• Poor connection • Make sure that an 8-pin twisted pair cable isused for connection.• Make sure that none of the CAT 5/CAT 5ecables in use are over 100 m (328 ft) inlength.• Make sure that a straight cable is used forconnection to a switching hub.• Network malfunction • Make sure that all network devices in useare switched on.• Make sure that there is no unwanted firewallin the IP network.SIP phones do not operate. • Mother boardmalfunction• Replace the mother board (be sure to turnoff the PBX when replacing).• SIP phone notregistered• Register the corresponding SIP phone.• SIP phone malfunction • Replace the SIP phone.• Poor connection • Make sure that an 8-pin twisted pair cable isused for connection.• Make sure that none of the CAT 5/CAT 5ecables in use are over 100 m (328 ft) inlength.• Make sure that a straight cable is used forconnection to a switching hub.• Network malfunction • Make sure that all network devices in useare switched on.• Make sure that the SIP phone is notblocked by the firewall or other networkdevices.6.1 Troubleshooting106 Getting Started
