[asterisk-users] Connecting Asterisk and BT Versatility PBX via NT BRI port

[Roberto Fichera]

Hi All,

I've a BT Versatility PBX that I want to connect to my asterisk 11.9.0 box via BRI port in NT
mode but actually I wasn't able to get it working. I've another standalone PBX, it's a
Panasonic model, which works fine connected to the same port. The BT connected to a UK
BT BRI line works quite fine after roughly a minute once connected. The PBX can be
seen at http://www.telephone-engineer.com/downloads/versatility/versatility-installation.pdf

Putting the pri span in debug mode I can see the following log continuously scrolling
and the PBX never synchronize with the openvox B400P card:

PRI Span: 1 TEI=0 MDL-ERROR (G): T200 expired N200 times sending SABME in state 5(Awaiting establishment)
PRI Span: 1 Changing from state 5(Awaiting establishment) to 4(TEI assigned)
PRI Span: 1 TEI=0 DL event: Q931_DL_EVENT_DL_RELEASE_IND(3)
PRI Span: 1 SAPI/TEI=0/0 Kick starting link
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 Changing from state 4(TEI assigned) to 5(Awaiting establishment)
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 MDL-ERROR (G): T200 expired N200 times sending SABME in state 5(Awaiting establishment)
PRI Span: 1 Changing from state 5(Awaiting establishment) to 4(TEI assigned)
PRI Span: 1 TEI=0 DL event: Q931_DL_EVENT_DL_RELEASE_IND(3)
PRI Span: 1 SAPI/TEI=0/0 Kick starting link
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 Changing from state 4(TEI assigned) to 5(Awaiting establishment)
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 MDL-ERROR (G): T200 expired N200 times sending SABME in state 5(Awaiting establishment)
PRI Span: 1 Changing from state 5(Awaiting establishment) to 4(TEI assigned)
PRI Span: 1 TEI=0 DL event: Q931_DL_EVENT_DL_RELEASE_IND(3)
PRI Span: 1 SAPI/TEI=0/0 Kick starting link
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 Changing from state 4(TEI assigned) to 5(Awaiting establishment)
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 MDL-ERROR (G): T200 expired N200 times sending SABME in state 5(Awaiting establishment)
PRI Span: 1 Changing from state 5(Awaiting establishment) to 4(TEI assigned)
PRI Span: 1 TEI=0 DL event: Q931_DL_EVENT_DL_RELEASE_IND(3)
PRI Span: 1 SAPI/TEI=0/0 Kick starting link
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 Changing from state 4(TEI assigned) to 5(Awaiting establishment)
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 MDL-ERROR (G): T200 expired N200 times sending SABME in state 5(Awaiting establishment)
PRI Span: 1 Changing from state 5(Awaiting establishment) to 4(TEI assigned)
PRI Span: 1 TEI=0 DL event: Q931_DL_EVENT_DL_RELEASE_IND(3)
PRI Span: 1 SAPI/TEI=0/0 Kick starting link
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 Changing from state 4(TEI assigned) to 5(Awaiting establishment)
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 MDL-ERROR (G): T200 expired N200 times sending SABME in state 5(Awaiting establishment)
PRI Span: 1 Changing from state 5(Awaiting establishment) to 4(TEI assigned)
PRI Span: 1 TEI=0 DL event: Q931_DL_EVENT_DL_RELEASE_IND(3)
PRI Span: 1 SAPI/TEI=0/0 Kick starting link
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 Changing from state 4(TEI assigned) to 5(Awaiting establishment)
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 TEI=0 MDL-ERROR (G): T200 expired N200 times sending SABME in state 5(Awaiting establishment)
PRI Span: 1 Changing from state 5(Awaiting establishment) to 4(TEI assigned)
PRI Span: 1 TEI=0 DL event: Q931_DL_EVENT_DL_RELEASE_IND(3)
PRI Span: 1 SAPI/TEI=0/0 Kick starting link
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1 Changing from state 4(TEI assigned) to 5(Awaiting establishment)
PRI Span: 1 TEI=0 Sending SABME

Below you can find the /etc/dahdi/system.conf
# Span 1: B4/0/1 "B4XXP (PCI) Card 0 Span 1" (MASTER) AMI/CCS RED
span=1,0,0,ccs,ami
# termtype: nt
bchan=1-2
hardhdlc=3
echocanceller=mg2,1-2

# Span 2: B4/0/2 "B4XXP (PCI) Card 0 Span 2" AMI/CCS RED
span=2,0,0,ccs,ami
# termtype: nt
bchan=4-5
hardhdlc=6
echocanceller=mg2,4-5

# Span 3: B4/0/3 "B4XXP (PCI) Card 0 Span 3" AMI/CCS RED
span=3,1,0,ccs,ami
# termtype: te
bchan=7-8
hardhdlc=9
echocanceller=mg2,7-8

# Span 4: B4/0/4 "B4XXP (PCI) Card 0 Span 4" AMI/CCS RED
span=4,2,0,ccs,ami
# termtype: te
bchan=10-11
hardhdlc=12
echocanceller=mg2,10-11

# Global data

loadzone    = uk
defaultzone    = uk

the /etc/asterisk/dahdi-channels.conf
group=0
context=from-PBX
overlapdial=yes
switchtype = euroisdn
signalling = bri_net
channel => 1-2
context=from-PBX

; Span 2: B4/0/2 "B4XXP (PCI) Card 0 Span 2" AMI/CCS RED
group=0
context=from-PBX
overlapdial=yes
switchtype = euroisdn
signalling = bri_net
channel => 4-5
context=from-PBX

; Span 3: B4/0/3 "B4XXP (PCI) Card 0 Span 3" AMI/CCS RED
group=1
context=from-NT1
overlapdial=yes
callerid=asreceived
switchtype = euroisdn
signalling = bri_cpe
channel => 7-8
context=from-NT1

; Span 4: B4/0/4 "B4XXP (PCI) Card 0 Span 4" AMI/CCS RED
group=1
context=from-NT1
overlapdial=yes
callerid=asreceived
switchtype = euroisdn
signalling = bri_cpe
channel => 10-11
context=from-NT1

the /etc/asterisk/chan_dahdi.conf

has the default settings and include the dahdi-channels.conf at the end.

Does anyone know how can I solve this problem?

Thanks in advance.
Roberto Fichera.