On Mon, Jan 20, 2014 at 5:16 PM, Dale Noll dn...@wi.rr.com wrote:
We fairly recently switched service providers for our 4 PRI circuits.
Since that time, we started to notice some failed inbound calls. These
calls terminate with an ISDN cause code 47 'resource unavailble'. Most of
the time I see this error on the first or second channel on the second span
in a trunk group (This is the providers trunk group for hunting, not an
Asterisk trunk group). All the PRIs are setup as individual spans, we are
not using NFAS. If the provider sets the hunt method to 'least recently
used channel', then I can receive calls on other channels on the secondary
span, it is just the first 2 that consistently fail.
We have had occasion where the error occurs on first span. If enough calls
come in at the same time, callers who happen to land on channel 3 or above
are OK. When the problem happens on the first span, if we physically
disconnect the first span(RED alarm), the calls hunt to the second span and
all calls seem to process properly. The only way to clear the cause 47
errors from the first span is a power cycle on the provider equipment.
Power cycling my equipment does not solve the problem, only when I cycle
their equipment.
The provider says the cause 47 is coming from my equipment, yet the 'core
set debug on' log, unless I am reading it wrong, says it is coming from
their side.
I have a second server as a backup. Both servers have identical hardware
and software. When switching to the backup server, the problem remains.
I had the same setup on the previous provider, except using NFAS, and did
not have this problem.
Am I reading the log correctly?
Yes. Asterisk has accepted the selected channel and CONNECTed the
call. It is the peer that is disconnecting the call with cause 47. This
really
appears to be a problem in the providers equipment.
Do I have something setup incorrectly?
I don't see anything wrong.
Is there any way to get even lower level debugging on the PRI?
Not really. The problem is at layer 3 (Q.931) not layer 2 (Q.921).
Turning on
intense PRI debug will add nothing but noise to the debug log.
snip
===
Log sample with ISDN debug on
===
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 Protocol Discriminator: Q.931 (8) len=87
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 TEI=0 Call Ref: len= 2 (reference 6918/0x1B06) (Sent from originator)
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 Message Type: SETUP (5)
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 [04 03 80 90 a2]
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 Bearer Capability (len= 5) [ Ext: 1 Coding-Std: 0 Info transfer
capability: Speech (0)
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 Ext: 1 Trans mode/rate: 64kbps,
circuit-mode (16)
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 User information layer 1: u-Law (34)
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 [18 03 a9 83 82]
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 Channel ID (len= 5) [ Ext: 1 IntID: Implicit Other(PRI) Spare: 0
Exclusive Dchan: 0
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4ChanSel: As indicated in following octets
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4Ext: 1 Coding: 0 Number Specified Channel
Type: 3
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4Ext: 1 Channel: 2 Type: CPE]
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 [1c 1d 9f 8b 01 00 a1 17 02 01 1f 02 01 00 80 0f 43 65 6c 6c 20 50 68
6f 6e 65 20 20 20 57 49]
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 Facility (len=31, codeset=0) [ 0x9F, 0x8B, 0x01, 0x00, 0xA1, 0x17,
0x02, 0x01, 0x1F, 0x02, 0x01, 0x00, 0x80, 0x0F, 'Cell Phone WI' ]
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 [28 0f 43 65 6c 6c 20 50 68 6f 6e 65 20 20 20 57 49]
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 Display (len=15) [ Cell Phone WI ]
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 [6c 0c 21 80 34 31 34 33 33 31 32 34 37 30]
[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04] PRI Span:
4 Calling Number (len=14) [ Ext: 0 TON: National Number (2) NPI:
ISDN/Telephony Numbering Plan (E.164/E.163) (1)
[Jan 14 12:56:04] VERBOSE[13262]
