AT&T DS1/DMi/ISDN-PRI manual BC System 85 R2V4 Only, Voice or Voice Grade Data

C-4ADMINISTRATIVE PROCEDURE SUMMARY

1

2

Use an ISDN-PRI trunk exclusively. When routed to a specific pattern, the first available ISDN trunk found in the highest preference is used. Non-ISDN trunk group preferences are skipped in the routing algorithm. If an ISDN-PRI trunk group is not translated in this pattern, the calling party hears intercept tone.

This encode can be used to ensure that an ISDN digital trunk is used for a certain set of users (such as high-speed data endpoints).

Use an ISDN trunk if one is available; otherwise use a facility of another type. The routing algorithm selects the first available ISDN trunk of the highest preference; otherwise it selects the first available non-ISDN trunk of the highest preference associated with the pattern.

Using this encode can, when possible, provide user-to-user information for a particular call (such as transporting of calling party name and number). When it is not possible to provide this information, call completion can still be achieved by selecting a non-ISDN facility.

BC (System 85 R2V4 Only)

Field 3 of this word is used to assign a BC to a class of extensions. The available encodes specify a BC of :

0Voice or voice-grade data

1Mode-1 data

2Mode-2 data

3Mode-3 data

4Mode-0 data

The assigned BC influences how the BC IE is coded for the setup message. The following defines the encoding of the BC IE for the 10 possible BCs.

Voice or Voice Grade Data

Opcode: 4

Information transfer capability: speech

Coding standard: CCITT

Information transfer rate: 64K-bps

Transfer mode: circuit mode

Layer and protocol identification: CCITT Mu-law speech (layer 1)

Mode 1	Opcode: 4
	Information transfer capability: restricted digital information
	Coding standard: CCITT
	Information transfer rate: 64K-bps
	Transfer mode: circuit mode
	Layer	and	protocol identification: rate adaption as specified in I.461 (layer
	1 )
	User	rate:	56K-bps