7.1.3 OperationNoteFor devices connected to a PBX other than the Main Unit, refer to the Troubleshooting for that PBX.PROBLEM PROBABLE CAUSE SOLUTION• Cannot set the IPaddress, subnet maskaddress, and PBX IPaddress to the IP-PT.• An unusable value isbeing set.• Set an IP address within the valid range.IP address of the IP-PT/PBX: "1.0.0.0" to"223.255.255.255" Subnet mask address:"0–255.0–255.0–255.0–255" (except"0.0.0.0" and "255.255.255.255")• Cannot register theIP-PT.• The necessary networkparameters are not setto the IP-PT.• When not using the DHCP Server featureor an external DHCP server, set the IPaddress, subnet mask address, and enterthe PBX IP address. If necessary, alsoenter the IP address of the defaultgateway.• When using the DHCP Server feature oran external DHCP server, enter the PBXIP address.• The IP-PT cannotconnect to the PBX.• The wrong IP address,subnet mask address,PBX IP address, ordefault gatewayaddress was entered.• Check each parameter and enter thecorrect value.• The Ethernet cable isnot connectedcorrectly.• Check the Ethernet cable connections.• The DHCP server is notactive.• Restart the external DHCP server.• Confirm whether the DHCP Server featureis enabled.• Disable DHCP and re-enter settings asappropriate.• Whenever you try tomake calls using a SIPphone, a busy tone isheard.• The status of the portthat the SIP phone isconnected to is Out ofService.• Change the port status from Out ofService to In Service using WebMaintenance Console.• The IP-PT does notring.• The ringer volume is off. • Turn on the ringer volume.• Originating an outsidecall, call transfer, orconference cannot beperformed.• The correspondingflexible button does notexist on the PT.• Programme the flexible button. Refer to"2.21.1 Fixed Buttons" in the FeatureGuide.• The IP address of thePBX for networking hasbeen forgotten.- • You can check the current IP address byPT Programming.For details, refer to the PT Programming[991] in PT Programming Manual.292 Installation Manual7.1.3 Operation
