Recommendations - 3Com NBX 100 Installation Manual

Recommendations

3Com recommends the following for ISDN PRI services.
Framing type
Recommended (also the default) configuration: Extended Super Frame
(ESF)
The multi-frame formats F4, F12 (D4 or SF), and F72 are also supported.
Zero Code Suppression
Recommended (also the default) configuration: B8ZS
AMI is also supported.
DID applications
For DID or DNIS, 3Com recommends that you order telephone numbers
that easily fit in the NBX 100 numbering plan. If possible, use 3 or 4 digit
DID/DNIS codes, which allow for simple dial plan implementation.
Recommended:
With 3 digit extensions 100-499, the last three digits of the DID/DNIS
codes should be 100-499.
With 4 digit extensions 1000-4999, the last four digits of the DID/DNIS
codes should be 1000-4999.
Line Hunting Sequence
3Com recommends that indicating the channel hunting sequence for
incoming calls. (Typically incoming calls are received starting on channel 1
and hunting up.) Have the client verify available service with the provider.
Supported Telephone Central Office Switch Protocols
NBX 100 ISDN PRI services support the following central office switch
protocols:
AT&T 5ESS Custom
I
DMS Custom
I
National ISDN NI-1/NI-2
I
Recommendations 289