Output Meaning
TX -> The message originating at the router.
RX <- The message received from the network.
SETUP Used to initiate a call. Either the network or the local router
can send it.
pd = 8 Indicates the protocol discriminator. The protocol discriminator
distinguishes messages for call control over the usernetwork
ISDN interface from other ITU-T-defined messages,
including other Q.931 messages.
Callref = 0x05 Indicates the number of calls the router has processed. It
increments every time a call goes out or comes in.
Bearer Capability i = 0x8890 The bearer service requested by the router.
88 = ITU coding standard, unrestricted digital information
90 = Circuit mode, 64Kbps
21 = Layer 1, V.110/X.30
8F = Synchronous, no in-band negotiation, 56Kbps
Channel ID i = 0x83 The channel Identifier. It indicates which B channel to use.
83 = Use any channel.
89 = Use B1.
8A = Use B2.
Keypad facility Also known as called party number.
DISCONNECT pd = 8 callref =
0x05 Cause i = 0x8090 - Normal
call clearing
The router is sending a DISCONNECT message to the network.
The reason for this disconnect is Normal call clearing
0x80. See “ISDN Switch Types, Codes, and Values” on Cisco
Connection Online (CCO) at www.cisco.com.