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10.3 Q.931 CALL-CONTROL MESSAGES 257011 1001 (57) Requested bearer capability not authorized100 0001 (65) Bearer capability not implemented111 0110 (102) Recovery action on expiration of a timerBellcore (new Teliodia) has specified a number of additional causes (coded asnetwork-specific) [9].IE.7—Channel Identification (Fig. 10.3-7). This IE identifies the B-channel tobe used for the call. Octets 3.1, 3.2, and 3.3 are included for primary rate DSLs only.Interface type:0 Basic rate DSL1 Primary rate DSLInformation channel selection identifies the B-channel on a basic rate DSL:01 Channel B 110 Channel B 2Channel number identifies the B-channel on a primary rate DSL.IE.8—High-Layer Compatibility (Fig. 10.3-8). This IE is used for the selectionof a compatible TE on the called DSL. It is transferred transparently across thenetwork.Figure 10.3-6. Format of IE.6 (cause). (From Rec. Q.931. Courtesy of ITU-T.)Figure 10.3-7. Format of IE.7 (channel identification). (From Rec. Q.931. Courtesy of ITU-T.)

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