[asterisk-users] Problem with "AT&T Maintenance" protocol in
PRIconnection, no B+D channels available
Michael Collins
mcollins at fcnetwork.com
Tue Mar 20 15:55:01 MST 2007
> I've never seen a PRI dchannel on a T1 on a timeslot other than the
> 24th. Are you sure that it's really on channel 23?
I think he meant channel 23 of channels 0~23, aka the 24th channel.
-MC
>
> Matthew Fredrickson
>
> On Mar 20, 2007, at 8:54 AM, Kanelbullar wrote:
>
> > Thanks for your answer, Bruno. However, the configuration you provided
> > is for an E1 connection and we are using a T1, having channel 23 as D
> > channel.
> >
> > Bruno De Luca <bdeluca at fgasoftware.com> escreveu: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) ]
> >>> __________________________________________________
> >>> Fale com seus amigos de graça com o novo Yahoo! Messenger
> >>> http://br.messenger.yahoo.com/
> >>> _______________________________________________ --Bandwidth and
> >>> Colocation provided by Easynews.com -- asterisk-users mailing
> >>> list To UNSUBSCRIBE or update options visit:
> >>> http://lists.digium.com/mailman/listinfo/asterisk-users
> >> _______________________________________________
> >> --Bandwidth and Colocation provided by Easynews.com --
> >>
> >> asterisk-users mailing list
> >> To UNSUBSCRIBE or update options visit:
> >> http://lists.digium.com/mailman/listinfo/asterisk-users
> >
> > __________________________________________________
> > Fale com seus amigos de graça com o novo Yahoo! Messenger
> > http://br.messenger.yahoo.com/
> > _______________________________________________
> > --Bandwidth and Colocation provided by Easynews.com --
> >
> > asterisk-users mailing list
> > To UNSUBSCRIBE or update options visit:
> > http://lists.digium.com/mailman/listinfo/asterisk-users
>
> _______________________________________________
> --Bandwidth and Colocation provided by Easynews.com --
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
> http://lists.digium.com/mailman/listinfo/asterisk-users
More information about the asterisk-users
mailing list