0x13 Directory Number (DN) Provisioning

Data[0] Number of Digits in DN (n)
Data[1] Digit 0
Data[2] Digit 1
:
Data[n] Digit n
Data[n+1] B Channel Access:
Bit 0 Access to B1
Bit 1 Access to B2
Bit 2 Access to B1 and B2
Bits 3-7 Reserved, must be 0x00

Bearer channel, 64Kbps (ISDN) The channel that carries the actual payload (as opposed to D-channels, which carry signaling data that helps route the payload).