[asterisk-gui] E1 Problems with Asterisknow - Help needed

[Abdul WASIM]

All of a sudden  my ISP decided to change some configurations of their
E1 Channels. Since then I am not able to make any calls or receive
call..

If I run the zap status I get the below error and also the warning 4201
messages are repeated. The errors are below

localhost*CLI> zap show status
Description                              Alarms     IRQ        bpviol
CRC4  
T4XXP (PCI) Card 0 Span 1                YEL        0          0
0     
T4XXP (PCI) Card 0 Span 2                RED        0          0
0     
T4XXP (PCI) Card 0 Span 3                UNCONFIGUR 0          0
0     
T4XXP (PCI) Card 0 Span 4                UNCONFIGUR 0          0
0     
  == Primary D-Channel on span 1 down
[Jul 28 09:10:06] WARNING[4201]: chan_zap.c:2401 pri_find_dchan: No
D-channels available!  Using Primary channel 16 as D-channel anyway!
  == Primary D-Channel on span 1 up
  == Primary D-Channel on span 1 up
  == Primary D-Channel on span 1 up
  == Primary D-Channel on span 1 up
[Jul 28 09:10:13] NOTICE[4217]: chan_sip.c:15049
handle_request_register: Registration from 'Abdul feshal
<sip:2224 at 192.168.1.109:5060>' failed for '192.168.1.57' - No matching
peer found
  == Primary D-Channel on span 1 down
[Jul 28 09:10:16] WARNING[4201]: chan_zap.c:2401 pri_find_dchan: No
D-channels available!  Using Primary channel 16 as D-channel anyway!
localhost*CLI>



My current version is 
Asterisk Build:
Asterisk SVN-tags_1.4.17
Asterisk GUI-version Revision: SVN-branches_asterisknow+r2268

 

When I try to dial a number I get the below  log.

- Executing [5024 at numberplan-custom-3:1] Dial("SIP/2010-b5900470",
"Zap/g2/772722136|50") in new stack
    -- Requested transfer capability: 0x00 - SPEECH
    -- Called g2/772722136
  == Primary D-Channel on span 1 down
[Jul 28 09:18:46] WARNING[4201]: chan_zap.c:2401 pri_find_dchan: No
D-channels available!  Using Primary channel 16 as D-channel anyway!
[Jul 28 09:18:46] WARNING[4703]: app_dial.c:738 wait_for_answer: Unable
to forward voice or dtmf
    -- Hungup 'Zap/1-1'
  == Everyone is busy/congested at this time (1:0/0/1)
  == Auto fallthrough, channel 'SIP/2010-b5900470' status is
'CHANUNAVAIL'


My service provider insists that there is no problem with their  E1. How
do I troubleshoot further or fix this issue. Please help.