Re: ISDN4BSD / ihfc0 in NT-mode setup

On Wed, Nov 08, 2006 at 03:12:33PM +0100, Hans Petter Selasky wrote:

> You need to configure "isdnd" before you can use "isdnphone". Try running 
> "capitest -u 0 -i 1 -o 1" instead.

  # capitest -u 0 -i 1 -o 1
  [...]
  main.c: capi_send_listen_request: sending listen request for
  incoming_calls
  dialing out, 1 / 1 ...
  main.c: cd_event: disconnected: normal call clearing

Concurrently

  # isdntrace -u 0 -b -i

  =========== isdntrace controller #0 =========== started Wed Nov  8 14:21:32 2006

  -- NT->TE - unit:00  frame:000068 - time:08.11 14:21:42.089982 - length:3 -----
  D01:000  02 01 7f                                               ................
  D01 ("isdndecode" can decode the data above)

  -- NT->TE - unit:00  frame:000069 - time:08.11 14:21:42.089991 - length:8 -----
  D01:000  02 01 00 00 08 01 7f 75                                .......u........

  -- NT->TE - unit:00  frame:000070 - time:08.11 14:21:42.089993 - length:8 -----
  D01:000  02 01 02 01 08 01 7f 75                                .......u........

  -- NT->TE - unit:00  frame:000071 - time:08.11 14:21:43.133560 - length:8 -----
  D01:000  02 01 00 00 08 01 7f 75                                .......u........

  -- NT->TE - unit:00  frame:000072 - time:08.11 14:21:43.133564 - length:8 -----
  D01:000  02 01 02 01 08 01 7f 75                                .......u........
  [...]

Decoding one of those with

  # isdndecode -u 0 -b -i

  -- TE->NT - unit:00 --------------- time:08.11 14:28:08.037067 ----------------
  L1 STATE: G3: Active

  -- NT->TE - unit:00  frame:000087 - time:08.11 14:28:09.072752 - length:8 -----
  L2 00 02 000000-- SAPI = 0                                       (Call Control)
           ------1- C/R = Command
           -------0 Extension Bit = 0             (with extension, octet follows)
  L2 01 01 0000000- TEI = 0 = 0x00                            (Non-automatic TEI)
           -------1 Extension Bit = 1                 (no extension, final octet)
  L2 02 00 0000000- N(S) = 0                               (send sequence number)
           -------0 I-Frame: Information transfer
  L2 03 00 0000000- N(R) = 0                            (receive sequence number)
           -------0 P/F, Poll = No Immediate Response Required
  L3 04 08 00001000 Protocol = Q.931/I.451/DSS1                            (0x08)
  L3 05 01 0000---- Call Reference
           ----0001 Call Reference length is 1 byte
  L3 06 7F 0------- Call Reference is sent from call originator
           -1111111 Call Reference = 127 = 0x7f
  L3 07 75 0------- Message type extension = 0
           -1110101 Message type = STATUS_ENQUIRY                          (0x75)

> > When I use the ISDN phone to dial any number, nothing happens, either, and
> > the phone shows "No connection", no trace output.
> 
> Do you have "isdnd" or "Asterisk+chan_capi" running ?

No, I wasn't.

> A quicky is to just: "cat /dev/i4b > /dev/null &"
> 
> Do any messages appear now?

Aha! Now when I pick up the ISDN phone I see

  # isdntrace -u 0 -b -i

  =========== isdntrace controller #0 =========== started Wed Nov  8 14:31:40 2006

  -- TE->NT - unit:00  frame:000093 - time:08.11 14:31:44.044581 - length:8 -----
  D01:000  fc ff 03 0f 42 d9 01 ff                                ....B...........
  D01 ("isdndecode" can decode the data above)

  -- TE->NT - unit:00  frame:000094 - time:08.11 14:31:46.044784 - length:8 -----
  D01:000  fc ff 03 0f 75 ac 01 ff                                ....u...........

  -- TE->NT - unit:00  frame:000095 - time:08.11 14:31:48.044987 - length:8 -----
  D01:000  fc ff 03 0f ec 70 01 ff                                .....p..........

And decoding that

  # isdndecode -u 0 -b -i

  =========== isdndecode controller #0 ========== started Wed Nov  8 14:33:28 2006

  -- TE->NT - unit:00  frame:000100 - time:08.11 14:33:31.805523 - length:8 -----
  L2 00 FC 111111-- SAPI = 63                                (Layer 2 Management)
           ------0- C/R = Command
           -------0 Extension Bit = 0             (with extension, octet follows)
  L2 01 FF 1111111- TEI = 127 = 0x7f                              (Broadcast TEI)
           -------1 Extension Bit = 1                 (no extension, final octet)
  L2 02 03 000-0011 U-Frame: UI                          (Unnumbered Information)
           ---0---- P/F, Poll = No Immediate Response Required
  L2 03 0F 00001111 MEI                            (Management Entity Identifier)
  L2 04 9F 10011111 Ri = 0x9fe6                           (Reference number high)
  L2 05 E6 11100110 Ri                                     (Reference Number low)
  L2 06 01 00000001 TEI Identity message = REQUEST                         (0x01)
  L2 07 FF 1111111- Ai = 127                                (Action Indicator = )
           -------1 Extension Bit = 1                 (no extension, final octet)

There is still no tone one the phone and it still produces the
"No connection" message, but I hope the output above might tell
what is wrong.

> If the messages you get use TEI 0 then it is P2P_NT you need to setup.

They do, right?

> "isdntest" can do some basic testing, but "capitest" is better. "isdntest" is 
> not installed by default.

Does the output above look ok? Does it mean the cabling is fine?

Next thing I need to do is set up isdnd, and then I can use capitest
to dial from the FreeBSD box to the phone (or does capitest itself
not require isdnd)?

Thank you for your help, much appreciated.

Daniel
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