[asterisk-users] PRI Setup problem

[Alvin Austin]

Hi everyone,

I'm trying to get a Sangoma A101D-X card talking to a Sasktel PRI 
(Megalink) circuit and having some trouble getting it to handshake.  
Thanks for any help or suggestions to diagnose this problem.


The problem is that Asterisk has trouble bringing up the link.  I see 
the following lines every couple of minutes:

  == 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
  == Primary D-Channel on span 1 up
  == Primary D-Channel on span 1 up
  == Primary D-Channel on span 1 up
h87*CLI> pri show spans
PRI span 1/0: Provisioned, Up, Active
h87*CLI> pri show spans
PRI span 1/0: Provisioned, Up, Active
  == Primary D-Channel on span 1 down
[Oct  1 17:52:49] WARNING[13164]: chan_zap.c:2393 pri_find_dchan: No 
D-channels available!  Using Primary channel 24 as D-channel anyway!
h87*CLI> pri show spans
PRI span 1/0: Provisioned, Down, Active
  == 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
h87*CLI> pri show spans
PRI span 1/0: Provisioned, Up, Active
  == 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
  == Primary D-Channel on span 1 down
[Oct  1 17:55:20] WARNING[13164]: chan_zap.c:2393 pri_find_dchan: No 
D-channels available!  Using Primary channel 24 as D-channel anyway!
h87*CLI> pri show spans
PRI span 1/0: Provisioned, Down, Active

Of course I cannot dial out:

    -- Executing [2446411 at default:1] NoOp("SIP/368-081f51d8", "Dial Time 
of Day via PRI") in new stack
    -- Executing [2446411 at default:2] Dial("SIP/368-081f51d8", 
"ZAP/3|2446411|30|Tt") in new stack
[Oct  1 18:01:27] WARNING[13623]: app_dial.c:1106 dial_exec_full: Unable 
to create channel of type 'ZAP' (cause 0 - Unknown)
  == Everyone is busy/congested at this time (1:0/0/1)
    -- Executing [2446411 at default :3] Congestion("SIP/368-081f51d8", "") 
in new stack
  == Spawn extension (default, 2446411, 3) exited non-zero on 
'SIP/368-081f51d8'

If I turn on pri debugging, I see lots of:

h87*CLI> pri debug span 1
Enabled debugging on span 1
Sending Set Asynchronous Balanced Mode Extended
Sending Set Asynchronous Balanced Mode Extended
Sending Set Asynchronous Balanced Mode Extended

Periodically I see:

Sending Set Asynchronous Balanced Mode Extended
Sending Set Asynchronous Balanced Mode Extended
-- Got SABME from network peer.
Sending Unnumbered Acknowledgement
q921.c:709 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED
q921.c:664 q921_dchannel_up: q921_state now is 
Q921_LINK_CONNECTION_ESTABLISHED
  == Primary D-Channel on span 1 up
-- Got SABME from network peer.
Sending Unnumbered Acknowledgement
q921.c:709 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED
q921.c:664 q921_dchannel_up: q921_state now is 
Q921_LINK_CONNECTION_ESTABLISHED
  == Primary D-Channel on span 1 up
-- Got SABME from network peer.
Sending Unnumbered Acknowledgement
q921.c:709 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED
q921.c:664 q921_dchannel_up: q921_state now is 
Q921_LINK_CONNECTION_ESTABLISHED
  == Primary D-Channel on span 1 up
-- Got SABME from network peer.
Sending Unnumbered Acknowledgement
q921.c:709 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED
q921.c:664 q921_dchannel_up: q921_state now is 
Q921_LINK_CONNECTION_ESTABLISHED
  == Primary D-Channel on span 1 up
 > Protocol Discriminator: Q.931 (8)  len=13
 > Call Ref: len= 2 (reference 0/0x0) (Originator)
 > Message type: RESTART (70)
 > [18 03 a9 83 88]
 > Channel ID (len= 5) [ Ext: 1  IntID: Implicit  PRI  Spare: 0  
Exclusive  Dchan: 0
 >                        ChanSel: Reserved
 >                       Ext: 1  Coding: 0  Number Specified  Channel 
Type: 3
 >                       Ext: 1  Channel: 8 ]
 > [79 01 80]
 > Restart Indentifier (len= 3) [ Ext: 1  Spare: 0  Resetting Indicated 
Channel (0) ]
-- Timeout occured, restarting PRI
q921.c:356 t200_expire: q921_state now is Q921_LINK_CONNECTION_RELEASED
Sending Set Asynchronous Balanced Mode Extended
q921.c:150 q921_send_sabme: q921_state now is Q921_AWAITING_ESTABLISH
  == Primary D-Channel on span 1 down
[Oct  1 18:04:09] WARNING[13164]: chan_zap.c:2393 pri_find_dchan: No 
D-channels available!  Using Primary channel 24 as D-channel anyway!
Sending Set Asynchronous Balanced Mode Extended
Sending Set Asynchronous Balanced Mode Extended


Any help is greatly appreciated!

Thanks,
Alvin