NEC SL1100 Adminstrators Manual page 5

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8.5 COS ......................................................................................................................................................... 27
8.6 Trunk to Trunk Routing - Optional ............................................................................................................. 28
Trunk to Trunk Transfer ............................................................................................................................................ 28
External Call Forward -COS....................................................................................................................................... 28
Trunk to Trunk Options ............................................................................................................................................ 28
8.7 Dialing Plan ............................................................................................................................................. 29
9 TROUBLESHOOTING AND USEFUL INFORMATION ............................................................. 30
9.1 Checking SIP Messaging To/From the PBX .................................................................................................. 30
9.2 Device Fails to Register ............................................................................................................................ 31
9.3 Outbound Calls Fail .................................................................................................................................. 32
9.4 Inbound Calls Fail ..................................................................................................................................... 33
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