Amt-Weiterleitung von anderer Anlage durchschleifen

[speedy1980]

Hallo,
Ich habe eine Auerswald TK-Anlage hinter meinem Asterisk, per PTMP angebunden an eine 4-Port BRI (HFC-4S). Asterisk selbst hängt zwischen Amtsanschluss und der Auerswald. Telefonieren funktioniert soweit, da gibt es keine Probleme.
Wenn jemand an einem ISDN Telefon hinter der Auerswald eine Umleitung im Amt einrichten will, so funktioniert das allerdings nicht. Das *21*Zielnummer kommt nicht als gewählte Nummer, sondern als "Keypad Facility".
Hier ein "pri debug":

3 < Protocol Discriminator: Q.931 (8)  len=22
3 < Call Ref: len= 1 (reference 17/0x11) (Originator)
3 < Message type: SETUP (5)
3 < [04 03 90 90 a3]
3 < Bearer Capability (len= 5) [ Ext: 1  Q.931 Std: 0  Info transfer capability: 3.1kHz audio (16)
3 <                              Ext: 1  Trans mode/rate: 64kbps, circuit-mode (16)
3 <                              Ext: 1  User information layer 1: A-Law (35)
3 < [18 01 83]
3 < Channel ID (len= 3) [ Ext: 1  IntID: Implicit, Other Spare: 0, Preferred Dchan: 0
3 <                        ChanSel: Any channel selectedNo channel selected
3                          ]
3 < [1e 02 85 83]
3 < Progress Indicator (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0) 0: 0   Location: Private network serving the remote user (5)
3 <                               Ext: 1  Progress Description: Calling equipment is non-ISDN. (3) ]
3 < [6c 04 00 80 38 30]
3 < Calling Number (len= 6) [ Ext: 0  TON: Unknown Number Type (0)  NPI: Unknown Number Plan (0)
3 <                           Presentation: Presentation permitted, user number not screened (0) '80' ]
3 -- Making new call for cr 17
3 -- Processing Q.931 Call Setup
3 -- Processing IE 4 (cs0, Bearer Capability)
3 -- Processing IE 24 (cs0, Channel Identification)
3 -- Processing IE 30 (cs0, Progress Indicator)
3 -- Processing IE 108 (cs0, Calling Party Number)
3 > Protocol Discriminator: Q.931 (8)  len=11
3 > Call Ref: len= 1 (reference 145/0x91) (Terminator)
3 > Message type: SETUP ACKNOWLEDGE (13)
3 > [18 01 8a]
3 > Channel ID (len= 3) [ Ext: 1  IntID: Implicit, Other Spare: 0, Exclusive Dchan: 0
3 >                        ChanSel: B2 channel
3                          ]
3 > [1e 02 81 88]
3 > Progress Indicator (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0) 0: 0   Location: Private network serving the local user (1)
3 >                               Ext: 1  Progress Description: Inband information or appropriate pattern now available. (8) ]
    -- Accepting overlap voice call from '80' to '<unspecified>' on channel 0/2, span 3
    -- Starting simple switch on 'Zap/8-1'
3 < Protocol Discriminator: Q.931 (8)  len=7
3 < Call Ref: len= 1 (reference 17/0x11) (Originator)
3 < Message type: INFORMATION (123)
3 < [2c 01 2a]
3 < Keypad Facility (len= 1) [ *É7 ]
3 -- Processing IE 44 (cs0, Keypad Facility)
3 < Protocol Discriminator: Q.931 (8)  len=7
3 < Call Ref: len= 1 (reference 17/0x11) (Originator)
3 < Message type: INFORMATION (123)
3 < [2c 01 30]
, ] Keypad Facility (len= 1) [ 0
3 -- Processing IE 44 (cs0, Keypad Facility)
3 < Protocol Discriminator: Q.931 (8)  len=7
3 < Call Ref: len= 1 (reference 17/0x11) (Originator)
3 < Message type: INFORMATION (123)
3 < [2c 01 37]
3 < Keypad Facility (len= 1) [ 7HÃ ]
3 -- Processing IE 44 (cs0, Keypad Facility)
3 < Protocol Discriminator: Q.931 (8)  len=7
3 < Call Ref: len= 1 (reference 17/0x11) (Originator)
3 < Message type: INFORMATION (123)
3 < [2c 01 36]
3 < Keypad Facility (len= 1) [ 6         ]
3 -- Processing IE 44 (cs0, Keypad Facility)
3 < Protocol Discriminator: Q.931 (8)  len=7
3 < Call Ref: len= 1 (reference 17/0x11) (Originator)
3 < Message type: INFORMATION (123)
3 < [2c 01 33]
3 < Keypad Facility (len= 1) [ 3CÅ ]
3 -- Processing IE 44 (cs0, Keypad Facility)
3 < Protocol Discriminator: Q.931 (8)  len=7
3 < Call Ref: len= 1 (reference 17/0x11) (Originator)
3 < Message type: INFORMATION (123)
3 < [2c 01 38]
3 < Keypad Facility (len= 1) [ 8ß ]
3 -- Processing IE 44 (cs0, Keypad Facility)
3 < Protocol Discriminator: Q.931 (8)  len=7
3 < Call Ref: len= 1 (reference 17/0x11) (Originator)
3 < Message type: INFORMATION (123)
3 < [2c 01 38]
3 < Keypad Facility (len= 1) [ 8uD ]
3 -- Processing IE 44 (cs0, Keypad Facility)
3 < Protocol Discriminator: Q.931 (8)  len=7
3 < Call Ref: len= 1 (reference 17/0x11) (Originator)
3 < Message type: INFORMATION (123)
3 < [2c 01 30]
3 < Keypad Facility (len= 1) [ 0|ì ]
3 -- Processing IE 44 (cs0, Keypad Facility)
3 < Protocol Discriminator: Q.931 (8)  len=7
3 < Call Ref: len= 1 (reference 17/0x11) (Originator)
3 < Message type: INFORMATION (123)
3 < [2c 01 31]

Und so weiter. Am Ende kommt dann

    -- Going to extension s|1 because of empty extension received on overlap call
    -- Executing Wait("Zap/8-1", "0.5") in new stack
  == Auto fallthrough, channel 'Zap/8-1' status is 'UNKNOWN'
    -- Hungup 'Zap/8-1'

Asterisk kann also nichts damit anfangen. Allerdings gibt es die Funktion ZapSendKeypadFacility: http://www.voipinfo.org/wiki/index.php?page=Asterisk+cmd+ZapSendKeypadFacility
Damit soll Asterisk zumindest selbst solche "Keypad Facility" senden können. Kann mir jemand sagen, wie ich mit Asterisk solche Sachen wie "Umleitung im Amt" von der TK-Anlage annehmen und an das Amt weitergeben kann?