[asterisk-users] Problem with "AT&T Maintenance" protocol in PRI
connection, no B+D channels available
Matthew Fredrickson
creslin at digium.com
Tue Mar 20 15:38:16 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?
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) ]
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