Spare Modems; Call Filtering - Bay Networks 6300 Supplement Manual

Chapter 5 Modems
Remote Annex 6300 Supplement to the Remote Annex Administrator's Guide for UNIX
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Spare Modems

Any available modem may be assigned to any call, regardless of the B
channel that the call arrives on. Since all available modems are used in
rotation, all modems in the RA 6300 are used. If a modem in a PRI/T1
environment fails, it is removed from the rotation and the RA 6300
continues to support a full PRI/T1 of 23 channels. If two modems fail in
an E1 environment, the RA 6300 continues to support a full PRI/E1 of
30 channels.

Call Filtering

The RA 6300 uses call filtering to decide whether to handle the call as a
modem call. Information contained in the ISDN D channel call setup
messages determines whether the RA 6300 will accept a call; treat the
call as Sync PPP, V.120, or an analog modem call; and start administrator-
specified processes, for example, CLI, PPP, SLIP, or ARA. The following
elements determine whether or not the RA 6300 accepts a call and treats
it as a modem call:
• Calling Party Number. This element identifies the originating
telephone number. The number may not be present due to user
specification or telephone network limitations. Therefore, a
determination based on this element may not always be possible.
• Called Party Number. This element identifies the number
dialed by the user. The PRI line may support multiple phone
numbers. Users of analog modems call a different number from
users of V.120 and Sync PPP. Similarly, users of V.120 call a
different number from users of modems or Sync PPP.
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