No outgoing calls over Sangoma E1 <-> PBX

Fellow Asterisk-Friends,

currently I’m implementing a Asterisk Server which is attached over e1 on our company’s phone system. The server should provide SIP phones the possibility to connect with and call internal or out to phones in our telecommunication system.
However I face with the problem, that the external trunk (e1) will not get up, outgoing calls brake up with the message

Enabled debugging on span 1 PRI Span: 1 PRI Span: 1 > DL-DATA request PRI Span: 1 > Protocol Discriminator: Q.931 (8) len=31 PRI Span: 1 > TEI=0 Call Ref: len= 2 (reference 1/0x1) (Sent from originator) PRI Span: 1 > Message Type: SETUP (5) PRI Span: 1 PRI Span: 1 > Protocol Discriminator: Q.931 (8) len=31 PRI Span: 1 > TEI=0 Call Ref: len= 2 (reference 1/0x1) (Sent from originator) PRI Span: 1 > Message Type: SETUP (5) PRI Span: 1 > [04 03 80 90 a3] PRI Span: 1 > Bearer Capability (len= 5) [ Ext: 1 Coding-Std: 0 Info transfer capability: Speech (0) PRI Span: 1 > Ext: 1 Trans mode/rate: 64kbps, circuit-mode (16) PRI Span: 1 > User information layer 1: A-Law (35) PRI Span: 1 > [18 03 a1 83 81] PRI Span: 1 > Channel ID (len= 5) [ Ext: 1 IntID: Implicit Other(PRI) Spare: 0 Preferred Dchan: 0 PRI Span: 1 > ChanSel: As indicated in following octets PRI Span: 1 > Ext: 1 Coding: 0 Number Specified Channel Type: 3 PRI Span: 1 > Ext: 1 Channel: 1 Type: CPE] PRI Span: 1 > [6c 06 41 80 36 33 35 34] PRI Span: 1 > Calling Party Number (len= 8) [ Ext: 0 TON: Subscriber Number (4) NPI: ISDN/Telephony Numbering Plan (E.164/E.163) (1) PRI Span: 1 > Presentation: Presentation allowed, User-provided, not screened (0) '6354' ] PRI Span: 1 > [70 06 c9 30 31 33 35 34] PRI Span: 1 > Called Party Number (len= 8) [ Ext: 1 TON: Subscriber Number (4) NPI: Private Numbering Plan (9) '01354' ] PRI Span: 1 PRI Span: 1 < Protocol Discriminator: Q.931 (8) len=12 PRI Span: 1 < TEI=0 Call Ref: len= 2 (reference 1/0x1) (Sent to originator) PRI Span: 1 < Message Type: STATUS (125) PRI Span: 1 < [08 02 81 e4] PRI Span: 1 < Cause (len= 4) [ Ext: 1 Coding: CCITT (ITU) standard (0) Spare: 0 Location: Private network serving the local user (1) PRI Span: 1 < Ext: 1 Cause: Invalid information element contents (100), class = Protocol Error (e.g. unknown message) (6) ] PRI Span: 1 < [14 01 06] PRI Span: 1 < Call State (len= 3) [ Ext: 0 Coding: CCITT (ITU) standard (0) Call state: Call Present (6) PRI Span: 1 PRI Span: 1 < Protocol Discriminator: Q.931 (8) len=9 PRI Span: 1 < TEI=0 Call Ref: len= 2 (reference 1/0x1) (Sent to originator) PRI Span: 1 < Message Type: RELEASE COMPLETE (90) PRI Span: 1 < [08 02 81 a9] PRI Span: 1 < Cause (len= 4) [ Ext: 1 Coding: CCITT (ITU) standard (0) Spare: 0 Location: Private network serving the local user (1) PRI Span: 1 < Ext: 1 Cause: Temporary failure (41), class = Network Congestion (resource unavailable) (2) ]

I tried with number 1354 (my deskphone) and 01354 (0 as prefix) and also the complete number with region information etc.

Configuration
Sangoma A104DE E1 Card
E1 line as External Trunk on our company’s telephone system

Versions:
* Asterisk 11.7 - latest
* Libpri 1.4.14 - latest
* Dahdi 2.8.0.1 - latest
* Sangoma wanpipe drivers 7.0.8

Has your card vendor been any help in diagnosing and resolving the problem?