Asterisk: невозможно создать канал типа DAHDI (причина 34 - Перегрузка цепи / канала)

Странная проблема началась вчера с нашей установкой Asterisk.

При наборе номера через ISDN BRI вызов не выполняется и регистрируется следующая ошибка:

Unable to create channel of type 'DAHDI' (cause 34 - Circuit/channel congestion)

Я перезапустил сервер, проверил файлы конфигурации и подтвердил с помощью Line Provider (BT), что на линии нет неисправности.

Входящие вызовы работают отлично, как и набор номера через PSTN.

На самом деле можно было бы использовать некоторые предложения, если у кого-то есть идеи?

dahdi-channels.conf:

; Autogenerated by /usr/sbin/dahdi_genconf on Thu Oct  9 10:05:01 2014
; If you edit this file and execute /usr/sbin/dahdi_genconf again,
; your manual changes will be LOST.
; Dahdi Channels Configurations (chan_dahdi.conf)
;
; This is not intended to be a complete chan_dahdi.conf. Rather, it is intended
; to be #include-d by /etc/chan_dahdi.conf that will include the global settings
;

; Span 1: XBUS-00/XPD-00 "Xorcom XPD #00/00: BRI_TE" (MASTER) AMI/CCS 
group=11
context=from-zaptel
switchtype = euroisdn
signalling = bri_cpe_ptmp
channel => 1-2
context = default


; Span 2: XBUS-00/XPD-01 "Xorcom XPD #00/01: BRI_TE" AMI/CCS 
group=12
context=from-zaptel
switchtype = euroisdn
signalling = bri_cpe_ptmp
channel => 4-5
context = default


; Span 3: XBUS-00/XPD-10 "Xorcom XPD #00/10: FXO" 
;;; line="7 XPP_FXO/00/10/0 FXSKS  (In use) (no pcm) (SWEC: OSLEC)"
signalling=fxs_ks
callerid=asreceived
group=0
context=from-zaptel
channel => 7
callerid=
group=
context=default

Раздел из диалплана:

[from-trunk]                ; just an alias since VoIP shouldn't be called PSTN
include => from-pstn

[from-pstn]
include => from-pstn-custom     ; create this context in extensions_custom.conf to include customizations
include => ext-did
include => ext-did-post-custom
include => from-did-direct      ; MODIFICATION (PL) for findmefollow if enabled, should be before ext-local
include => ext-did-catchall     ; THIS MUST COME AFTER ext-did
exten => fax,1,Goto(ext-fax,in_fax,1)

И журнал отладки для PRI с уровнем детализации 127 и отладкой 50 ...

localhost*CLI> originate dahdi/g11/01234567890 application playback demo-congrats
1 -- Making new call for cr 226
    -- Requested transfer capability: 0x00 - SPEECH
1 -- Restarting T203 counter
1 > Protocol Discriminator: Q.931 (8)  len=31
1 > Call Ref: len= 1 (reference 98/0x62) (Originator)
1 > Message type: SETUP (5)
1 > [04 03 80 90 a3]
1 > Bearer Capability (len= 5) [ Ext: 1  Q.931 Std: 0  Info transfer capability: Speech (0)
1 >                              Ext: 1  Trans mode/rate: 64kbps, circuit-mode (16)
1 >                              Ext: 1  User information layer 1: A-Law (35)
1 > [18 01 81]
1 > Channel ID (len= 3) [ Ext: 1  IntID: Implicit  Other  Spare: 0  Preferred  Dchan: 0
1 >                        ChanSel: B1 channel
1                          ]
1 > [6c 02 21 83]
1 > Calling Number (len= 4) [ Ext: 0  TON: National Number (2)  NPI: ISDN/Telephony Numbering Plan (E.164/E.163) (1)
1 >                           Presentation: Presentation allowed of network provided number (3)  '' ]
1 > [70 0c a1 30 37 37 34 37 36 30 33 36 32 33]
1 > Called Number (len=14) [ Ext: 1  TON: National Number (2)  NPI: ISDN/Telephony Numbering Plan (E.164/E.163) (1)  '01234567890' ]
1 > [a1]
1 > Sending Complete (len= 1)
1 q931.c:3637 q931_setup: call 226 on channel 1 enters state 1 (Call Initiated)
1 -- Restarting T203 counter
1 -- Restarting T203 counter
1 < Protocol Discriminator: Q.931 (8)  len=7
1 < Call Ref: len= 1 (reference 226/0xE2) (Terminator)
1 < Message type: CALL PROCEEDING (2)
1 < [18 01 89]
1 < Channel ID (len= 3) [ Ext: 1  IntID: Implicit  Other  Spare: 0  Exclusive  Dchan: 0
1 <                        ChanSel: B1 channel
1                          ]
1 -- Processing IE 24 (cs0, Channel Identification)
1 q931.c:4405 q931_receive: call 226 on channel 1 enters state 3 (Outgoing call  Proceeding)
1 -- Restarting T203 counter
1 -- Restarting T203 counter
1 -- Restarting T203 counter
1 -- Restarting T203 counter
1 < Protocol Discriminator: Q.931 (8)  len=12
1 < Call Ref: len= 1 (reference 226/0xE2) (Terminator)
1 < Message type: DISCONNECT (69)
1 < [08 02 82 81]
1 < Cause (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0)  Spare: 0  Location: Public network serving the local user (2)
1 <                  Ext: 1  Cause: Unallocated (unassigned) number (1), class = Normal Event (0) ]
1 < [1e 02 82 88]
1 < Progress Indicator (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0)  0: 0  Location: Public network serving the local user (2)
1 <                               Ext: 1  Progress Description: Inband information or appropriate pattern now available. (8) ]
1 -- Processing IE 8 (cs0, Cause)
1 -- Processing IE 30 (cs0, Progress Indicator)
1 q931.c:4558 q931_receive: call 226 on channel 1 enters state 12 (Disconnect Indication)
1 -- Restarting T203 counter
    -- Channel 0/1, span 1 got hangup request, cause 1
1 NEW_HANGUP DEBUG: Calling q931_hangup, ourstate Disconnect Indication, peerstate Disconnect Request
1 q931.c:3435 q931_release: call 226 on channel 1 enters state 19 (Release Request)
1 -- Restarting T203 counter
1 > Protocol Discriminator: Q.931 (8)  len=8
1 > Call Ref: len= 1 (reference 98/0x62) (Originator)
1 > Message type: RELEASE (77)
1 > [08 02 81 81]
1 > Cause (len= 4) [ Ext: 1  Coding: CCITT (ITU) standard (0)  Spare: 0  Location: Private network serving the local user (1)
1 >                  Ext: 1  Cause: Unallocated (unassigned) number (1), class = Normal Event (0) ]
    -- Hungup 'DAHDI/1-1'
1 -- Restarting T203 counter
1 -- Restarting T203 counter
1 < Protocol Discriminator: Q.931 (8)  len=4
1 < Call Ref: len= 1 (reference 226/0xE2) (Terminator)
1 < Message type: RELEASE COMPLETE (90)
1 q931.c:4490 q931_receive: call 226 on channel 1 enters state 0 (Null)
1 NEW_HANGUP DEBUG: Calling q931_hangup, ourstate Null, peerstate Null
1 NEW_HANGUP DEBUG: Destroying the call, ourstate Null, peerstate Null
1 -- Restarting T203 counter

Спасибо.