Troubleshooting guide

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Installation Planner
Increasing DSP Resources
You can add Dual or Quad DSP modules to
• increase the number of voice mail ports
• increase telephony resources to support more TDM devices
• add compression channels (limited applications)
You can add DSP II modules to
• add compression channels
• provide FAX Relay (T.38) support
Table 55: Telephone Compression Conditions
Call setup conditions
G729
compression
supported
Compression
DSP required
IP Phone to IP Phone
(except 5x01, 5x05, and 5207)
Yes No
IP Phone to IP Trunk to IP Phone
(except 5x01, 5x05, and 5207)
Yes No
IP Phone to TDM Phone Yes Yes
IP Phone to Embedded voice mail Yes Yes
IP Phone in conference Yes Yes
IP Phone on Hold, listening to music Yes Yes
IP Phone listening to music No n/a
TDM Phone to IP Trunk to TDM Phone Yes Yes
Direct Set-to-set paging (using first codec) Yes No
any call to or from Nupoint IP No No
any call to or from Teleworker (See Note) No No
any call to or from Mobile Extension (ME)
(See Note)
No No
Note: The application server may support compression for these telephones.
Refer to application documentation for more information.