[asterisk-users] Problem with "AT&T Maintenance" protocol in
PRI connection, no B+D channels available
Bruno De Luca
bdeluca at fgasoftware.com
Tue Mar 20 06:36:49 MST 2007
d-channel is in midle
bchan=1-15,17-31
dchan=16
loadzone = it
defaultzone = it
Kanelbullar wrote:
> Hi guys,
>
> We are experiencing a problem with a T1 PRI connection. After trying a
> number of variations in the configuration files, the behavior is
> always the same: no B channels come up and the D channel doesn't
> appear to be working well. We can see there are AT&T Maintenance
> messages being exchanged by asterisk and the provider, CONNECT and
> CONNECT ACKNOWLEDGE, but that doesn't appear to be enough to bring the
> D and B channels properly up. Are there any messages missing? When we
> attempt to make a call, we can see the Q.931 SETUP message being sent.
> But shortly after we are getting a LAPD DISC message, which ends up
> originating a Q.931 DISCONNECT message, terminating the call.
>
> What could be the problem here?
>
> * Could there be any configuration issue on our side?
> * Does libpri provide complete support to the AT&T Maintenance
> protocol or could this connection be incompatible?
>
>
> Any help would be highly appreciated.
>
> Many thanks in advance,
> Paulo
>
> ----------------------------------------------------------------
> PS: Configuration files, messages and pri debug snippets follow
>
> zaptel.conf
> ----------------
> loadzone = us
> defaultzone=us
> #Span 1: TE2/0/1 "T2XXP (PCI) Card 0 Span 1" PRI_T1
> span=1,0,0,esf,b8zs,crc4
> bchan=1-23
> dchan=24
>
> zapata.conf
> ----------------
> [channels]
> group = 0
> usecallingpres = yes
> switchtype = national
> context = inbound
> signalling = pri_cpe
> usecallerid = yes
> channel = 1-23
>
> messages
> --------------
> Mar 19 15:32:23 NOTICE[3306] cdr.c: CDR logging disabled, data will be
> lost.
> Mar 19 15:32:23 WARNING[3306] pbx_ael.c: Unable to open
> '/etc/asterisk/extensions.ael': No such file or directory
> Mar 19 15:32:23 WARNING[3306] pbx.c: Requested contexts didn't get merged
> Mar 19 15:33:17 WARNING[3322] chan_zap.c: No D-channels available!
> Using Primary channel 24 as D-channel anyway!
> Mar 19 15:33:58 WARNING[3322] chan_zap.c: No D-channels available!
> Using Primary channel 24 as D-channel anyway!
> Mar 19 15:33:58 WARNING[3366] app_dial.c: Unable to forward voice
> [...]
>
> pri debug span
> ----------------------
> > [ 00 01 0a 0a 03 01 00 07 01 01 c0 18 01 ac ]
> > Informational frame:
> > SAPI: 00 C/R: 0 EA: 0
> > TEI: 000 EA: 1
> > N(S): 005 0: 0
> > N(R): 005 P: 0
> > 10 bytes of data
> -- Restarting T203 counter
> Stopping T_203 timer
> Starting T_200 timer
> > Protocol Discriminator: AT&T Maintenance (3) len=10
> > Call Ref: len= 1 (reference 0/0x0) (Originator)
> > Message type: CONNECT (7)
> > [01 01 c0]
> > IE: Change Status (len = 3)
> > [18 01 ac]
> > Channel ID (len= 3) [ Ext: 1 IntID: Implicit, PRI Spare: 0,
> Exclusive Dchan: 1
> > ChanSel: As indicated in following octets
> ]
> (...)
> < [ 02 01 0a 0c 03 01 00 0f 01 01 c0 18 01 ac ]
> < Informational frame:
> < SAPI: 00 C/R: 1 EA: 0
> < TEI: 000 EA: 1
> < N(S): 005 0: 0
> < N(R): 006 P: 0
> < 10 bytes of data
> -- ACKing all packets from 5 to (but not including) 6
> -- Since there was nothing left, stopping T200 counter
> -- Stopping T203 counter since we got an ACK
> -- Nothing left, starting T203 counter
> < Protocol Discriminator: AT&T Maintenance (3) len=10
> < Call Ref: len= 1 (reference 0/0x0) (Originator)
> < Message type: CONNECT ACKNOWLEDGE (15)
> < [01 01 c0]
> < IE: Change Status (len = 3)
> < [18 01 ac]
> < Channel ID (len= 3) [ Ext: 1 IntID: Implicit, PRI Spare: 0,
> Exclusive Dchan: 1
> < ChanSel: As indicated in following octets
> ]
> (...)
> > Protocol Discriminator: Q.931 (8) len=40
> > Call Ref: len= 2 (reference 2/0x2) (Originator)
> > Message type: SETUP (5)
> > [04 03 80 90 a2]
> > Bearer Capability (len= 5) [ Ext: 1 Q.931 Std: 0 Info transfer
> capability: Speech (0)
> > Ext: 1 Trans mode/rate: 64kbps,
> circuit-mode (16)
> > Ext: 1 User information layer 1: u-Law
> (34)
> > [18 03 a9 83 82]
> > 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: 2 ]
> > [1e 02 80 83]
> > Progress Indicator (len= 4) [ Ext: 1 Coding: CCITT (ITU) standard
> (0) 0: 0 Location: User (0)
> > Ext: 1 Progress Description: Calling
> equipment is non-ISDN. (3) ]
> > [6c 06 21 80 37 31 30 30]
> > Calling Number (len= 8) [ Ext: 0 TON: National Number (2) NPI:
> ISDN/Telephony Numbering Plan (E.164/E.163) (1)
> > Presentation: Presentation permitted, user
> number not screened (0) '7100' ]
> > [70 0b a1 35 38 35 34 31 39 37 39 39 35]
> > Called Number (len=13) [ Ext: 1 TON: National Number (2) NPI:
> ISDN/Telephony Numbering Plan (E.164/E.163) (1) '5854197995' ]
> (...)
> < [ 02 01 53 ]
> < Unnumbered frame:
> < SAPI: 00 C/R: 1 EA: 0
> < TEI: 000 EA: 1
> < M3: 2 P/F: 1 M2: 0 11: 3 [ DISC (disconnect) ]
> < 0 bytes of data
> -- Got Disconnect from peer.
> Sending Unnumbered Acknowledgement
> > [ 02 01 73 ]
> > Unnumbered frame:
> > SAPI: 00 C/R: 1 EA: 0
> > TEI: 000 EA: 1
> > M3: 3 P/F: 1 M2: 0 11: 3 [ UA (unnumbered acknowledgement) ]
> > 0 bytes of data
> -- Restarting T203 counter
> > [ 00 01 00 00 08 02 00 02 45 08 02 81 90 ]
> > Informational frame:
> > SAPI: 00 C/R: 0 EA: 0
> > TEI: 000 EA: 1
> > N(S): 000 0: 0
> > N(R): 000 P: 0
> > 9 bytes of data
> Starting T_200 timer
> > Protocol Discriminator: Q.931 (8) len=9
> > Call Ref: len= 2 (reference 2/0x2) (Originator)
> > Message type: DISCONNECT (69)
> > [08 02 81 90]
> > Cause (len= 4) [ Ext: 1 Coding: CCITT (ITU) standard (0) 0: 0
> Location: Private network serving the local user (1)
> > Ext: 1 Cause: Unknown (16), class = Normal Event (1) ]
>
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