# d\_channel up and down. console warning

**URL:** <https://community.asterisk.org/t/d-channel-up-and-down-console-warning/43754>\
**Category:** Asterisk Support\
**Created:** [August 27, 2013, 10:35am UTC](https://community.asterisk.org/t/d-channel-up-and-down-console-warning/43754 "2013-08-27T10:35:39Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![lorenzo\_s](https://avatars.discourse-cdn.com/v4/letter/l/eb8c5e/32.png) [@lorenzo\_s](https://community.asterisk.org/u/lorenzo_s)\
**Post date:** [August 27, 2013, 10:35am UTC](https://community.asterisk.org/t/d-channel-up-and-down-console-warning/43754/1 "2013-08-27T10:35:39Z")

</div>

Hello support:  
I’m receiving strange warnings in my asterisk console:  
pri\_find\_dchan: Span 1: D-channel is down!  
Span 1: D-channel is up!

the call are dropping after 10-30 second. need real help…

thanks in advance

I’m using asterisk 1.8.23  
dahdi-linux-complete-2.7.0.1+2.7.0.1  
libpri-1.4.14

ok. here the list of log, output,debug,conf ecc ecc ecc…

lsdhadi output:

[code]lsdahdi

### Span 1: XBUS-00/XPD-00 “Xorcom XPD [usb].1: E1” (MASTER) CCSHDB3//CRC4 ClockSource

1 E1 Clear (In use) (EC: XPP - INACTIVE)  
2 E1 Clear (In use) (EC: XPP - INACTIVE)  
3 E1 Clear (In use) (EC: XPP - INACTIVE)  
4 E1 Clear (In use) (EC: XPP - INACTIVE)  
5 E1 Clear (In use) (EC: XPP - INACTIVE)  
6 E1 Clear (In use) (EC: XPP - INACTIVE)  
7 E1 Clear (In use) (EC: XPP - INACTIVE)  
8 E1 Clear (In use) (EC: XPP - INACTIVE)  
9 E1 Clear (In use) (EC: XPP - INACTIVE)  
10 E1 Clear (In use) (EC: XPP - INACTIVE)  
11 E1 Clear (In use) (EC: XPP - INACTIVE)  
12 E1 Clear (In use) (EC: XPP - INACTIVE)  
13 E1 Clear (In use) (EC: XPP - INACTIVE)  
14 E1 Clear (In use) (EC: XPP - INACTIVE)  
15 E1 Clear (In use) (EC: XPP - INACTIVE)  
16 E1 HDLCFCS (In use) (EC: XPP - INACTIVE)  
17 E1 Clear (In use) (EC: XPP - INACTIVE)  
18 E1 Clear (In use) (EC: XPP - INACTIVE)  
19 E1 Clear (In use) (EC: XPP - INACTIVE)  
20 E1 Clear (In use) (EC: XPP - INACTIVE)  
21 E1 Clear (In use) (EC: XPP - INACTIVE)  
22 E1 Clear (In use) (EC: XPP - INACTIVE)  
23 E1 Clear (In use) (EC: XPP - INACTIVE)  
24 E1 Clear (In use) (EC: XPP - INACTIVE)  
25 E1 Clear (In use) (EC: XPP - INACTIVE)  
26 E1 Clear (In use) (EC: XPP - INACTIVE)  
27 E1 Clear (In use) (EC: XPP - INACTIVE)  
28 E1 Clear (In use) (EC: XPP - INACTIVE)  
29 E1 Clear (In use) (EC: XPP - INACTIVE)  
30 E1 Clear (In use) (EC: XPP - INACTIVE)  
31 E1 Clear (In use) (EC: XPP - INACTIVE)  
[/code]

dahdi\_hardware -v

`usb:001/007 xpp_usb+ e4e4:1162 Astribank-modular FPGA-firmware
 LABEL=[usb] CONNECTOR=@usb-0000:00:1d.7-8
        XBUS-00/XPD-00: E1 (31) Span 1 DAHDI-SYNC
        XBUS-00/XPD-01: E1 (31) Span 2
        XBUS-00/XPD-10: FXS (8) Span 3
        XBUS-00/XPD-20: FXS (8) Span 4
        XBUS-00/XPD-40: ECHO (0) Unregistered
`

some console output:

` == Primary D-Channel on span 1 down
[Aug 27 12:20:10] WARNING[24502]: sig_pri.c:1126 pri_find_dchan: Span 1: D-channel is down!
`

debug pri on:

`PRI Span: 1 > TEI: 0 State 8(Timer recovery)
PRI Span: 1 > V(A)=3, V(S)=3, V(R)=6
PRI Span: 1 > K=7, RC=2, l3_initiated=0, reject_except=0, ack_pend=0
PRI Span: 1 > T200_id=0, N200=3, T203_id=0
PRI Span: 1 > [00 01 01 0d]
PRI Span: 1 > Supervisory frame:
PRI Span: 1 > SAPI: 00 C/R: 0 EA: 0
PRI Span: 1 > TEI: 000 EA: 1
PRI Span: 1 > Zero: 0 S: 0 01: 1 [RR (receive ready)]
PRI Span: 1 > N(R): 006 P/F: 1
PRI Span: 1 > 0 bytes of data
PRI Span: 1 -- Starting T200 timer
PRI Span: 1 t200_expire
PRI Span: 1 TEI: 0 State 8(Timer recovery)
PRI Span: 1 V(A)=3, V(S)=3, V(R)=6
PRI Span: 1 K=7, RC=3, l3_initiated=0, reject_except=0, ack_pend=0
PRI Span: 1 T200_id=8192, N200=3, T203_id=0
PRI Span: 1 TEI=0 MDL-ERROR (I): T200 expired N200 times sending RR/RNR in state 8(Timer recovery)
PRI Span: 1 -- T203 requested to stop when not started
PRI Span: 1 -- Restarting T200 timer
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1
PRI Span: 1 > TEI: 0 State 8(Timer recovery)
PRI Span: 1 > V(A)=3, V(S)=3, V(R)=6
PRI Span: 1 > K=7, RC=0, l3_initiated=0, reject_except=0, ack_pend=0
PRI Span: 1 > T200_id=8193, N200=3, T203_id=0
PRI Span: 1 > [00 01 7f]
PRI Span: 1 > Unnumbered frame:
PRI Span: 1 > SAPI: 00 C/R: 0 EA: 0
PRI Span: 1 > TEI: 000 EA: 1
PRI Span: 1 > M3: 3 P/F: 1 M2: 3 11: 3 [SABME (set asynchronous balanced mode extended)]
PRI Span: 1 > 0 bytes of data
PRI Span: 1 Changing from state 8(Timer recovery) to 5(Awaiting establishment)
Span 1: Processing event PRI_EVENT_DCHAN_DOWN
PRI Span: 1 t200_expire
PRI Span: 1 TEI: 0 State 5(Awaiting establishment)
PRI Span: 1 V(A)=3, V(S)=3, V(R)=6
PRI Span: 1 K=7, RC=0, l3_initiated=0, reject_except=0, ack_pend=0
PRI Span: 1 T200_id=8193, N200=3, T203_id=0
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1
PRI Span: 1 > TEI: 0 State 5(Awaiting establishment)
PRI Span: 1 > V(A)=3, V(S)=3, V(R)=6
PRI Span: 1 > K=7, RC=1, l3_initiated=0, reject_except=0, ack_pend=0
PRI Span: 1 > T200_id=0, N200=3, T203_id=0
PRI Span: 1 > [00 01 7f]
PRI Span: 1 > Unnumbered frame:
PRI Span: 1 > SAPI: 00 C/R: 0 EA: 0
PRI Span: 1 > TEI: 000 EA: 1
PRI Span: 1 > M3: 3 P/F: 1 M2: 3 11: 3 [SABME (set asynchronous balanced mode extended)]
PRI Span: 1 > 0 bytes of data
PRI Span: 1 -- Starting T200 timer
PRI Span: 1 t200_expire
PRI Span: 1 TEI: 0 State 5(Awaiting establishment)
PRI Span: 1 V(A)=3, V(S)=3, V(R)=6
PRI Span: 1 K=7, RC=1, l3_initiated=0, reject_except=0, ack_pend=0
PRI Span: 1 T200_id=8192, N200=3, T203_id=0
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1
PRI Span: 1 > TEI: 0 State 5(Awaiting establishment)
PRI Span: 1 > V(A)=3, V(S)=3, V(R)=6
PRI Span: 1 > K=7, RC=2, l3_initiated=0, reject_except=0, ack_pend=0
PRI Span: 1 > T200_id=0, N200=3, T203_id=0
PRI Span: 1 > [00 01 7f]
PRI Span: 1 > Unnumbered frame:
PRI Span: 1 > SAPI: 00 C/R: 0 EA: 0
PRI Span: 1 > TEI: 000 EA: 1
PRI Span: 1 > M3: 3 P/F: 1 M2: 3 11: 3 [SABME (set asynchronous balanced mode extended)]
PRI Span: 1 > 0 bytes of data
PRI Span: 1 -- Starting T200 timer
PRI Span: 1
PRI Span: 1 < TEI: 0 State 5(Awaiting establishment)
PRI Span: 1 < V(A)=3, V(S)=3, V(R)=6
PRI Span: 1 < K=7, RC=2, l3_initiated=0, reject_except=0, ack_pend=0
PRI Span: 1 < T200_id=8192, N200=3, T203_id=0
PRI Span: 1 < [02 01 7f]
PRI Span: 1 < Unnumbered frame:
PRI Span: 1 < SAPI: 00 C/R: 1 EA: 0
PRI Span: 1 < TEI: 000 EA: 1
PRI Span: 1 < M3: 3 P/F: 1 M2: 3 11: 3 [SABME (set asynchronous balanced mode extended)]
PRI Span: 1 < 0 bytes of data
PRI Span: 1 TEI=0 Got SABME from network peer.
PRI Span: 1 TEI=0 Sending UA
PRI Span: 1
PRI Span: 1 > TEI: 0 State 5(Awaiting establishment)
PRI Span: 1 > V(A)=3, V(S)=3, V(R)=6
PRI Span: 1 > K=7, RC=2, l3_initiated=0, reject_except=0, ack_pend=0
PRI Span: 1 > T200_id=8192, N200=3, T203_id=0
PRI Span: 1 > [02 01 73]
PRI Span: 1 > Unnumbered frame:
PRI Span: 1 > SAPI: 00 C/R: 1 EA: 0
PRI Span: 1 > TEI: 000 EA: 1
PRI Span: 1 > M3: 3 P/F: 1 M2: 0 11: 3 [UA (unnumbered acknowledgement)]
PRI Span: 1 > 0 bytes of data
PRI Span: 1 Done handling message for SAPI/TEI=0/0
PRI Span: 1 t200_expire
PRI Span: 1 TEI: 0 State 5(Awaiting establishment)
PRI Span: 1 V(A)=3, V(S)=3, V(R)=6
PRI Span: 1 K=7, RC=2, l3_initiated=0, reject_except=0, ack_pend=0
PRI Span: 1 T200_id=8192, N200=3, T203_id=0
PRI Span: 1 TEI=0 Sending SABME
PRI Span: 1
PRI Span: 1 > TEI: 0 State 5(Awaiting establishment)
PRI Span: 1 > V(A)=3, V(S)=3, V(R)=6
PRI Span: 1 > K=7, RC=3, l3_initiated=0, reject_except=0, ack_pend=0
PRI Span: 1 > T200_id=0, N200=3, T203_id=0
PRI Span: 1 > [00 01 7f]
PRI Span: 1 > Unnumbered frame:
PRI Span: 1 > SAPI: 00 C/R: 0 EA: 0
PRI Span: 1 > TEI: 000 EA: 1
PRI Span: 1 > M3: 3 P/F: 1 M2: 3 11: 3 [SABME (set asynchronous balanced mode extended)]
PRI Span: 1 > 0 bytes of data
PRI Span: 1 -- Starting T200 timer
PRI Span: 1
PRI Span: 1 < TEI: 0 State 5(Awaiting establishment)
PRI Span: 1 < V(A)=3, V(S)=3, V(R)=6
PRI Span: 1 < K=7, RC=3, l3_initiated=0, reject_except=0, ack_pend=0
PRI Span: 1 < T200_id=8192, N200=3, T203_id=0
PRI Span: 1 < [00 01 73]
PRI Span: 1 < Unnumbered frame:
PRI Span: 1 < SAPI: 00 C/R: 0 EA: 0
PRI Span: 1 < TEI: 000 EA: 1
PRI Span: 1 < M3: 3 P/F: 1 M2: 0 11: 3 [UA (unnumbered acknowledgement)]
PRI Span: 1 < 0 bytes of data
PRI Span: 1 TEI=0 Got UA
PRI Span: 1 -- Stopping T200 timer
PRI Span: 1 -- Starting T203 timer
PRI Span: 1 Changing from state 5(Awaiting establishment) to 7(Multi-frame established)
PRI Span: 1 Done handling message for SAPI/TEI=0/0
Span 1: Processing event PRI_EVENT_DCHAN_UP
`

dhadi system.conf relevant line file:

[code]span=1,1,0,ccs,hdb3,crc4

# termtype: te

bchan=1-15,17-31  
dchan=16  
echocanceller=hwec,1-15,17-31

# Global data

loadzone = it  
defaultzone = it  
[/code]

chan\_dahdi.conf

```auto
[channels]

overlapdial=yes
faxdetect=no
busydetect=yes
threewaycalling=yes
cancallforward=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=no
switchtype=euroisdn
callerid=asreceived
relaxdtmf=yes
signalling = pri_cpe
context = from-pstn
group=1
channel => 1-15,17-31

```