buffer re-sync problems

Hello,

I just purchased an A1200p with 5FXS/3FXO installed.
Running Trixbox 2.6 on a Dell SC420.

I am getting a constant stream of log messages on buffer re-sync:

Jun 9 16:06:20 trixbox kernel: buffer re-sync occur from 0 to 3
Jun 9 16:06:20 trixbox kernel: buffer re-sync occur from 3 to 2
Jun 9 16:06:20 trixbox kernel: buffer re-sync occur from 2 to 1
Jun 9 16:06:25 trixbox kernel: buffer re-sync occur from 1 to 0
Jun 9 16:08:09 trixbox kernel: buffer re-sync occur from 0 to 2
Jun 9 16:10:24 trixbox kernel: buffer re-sync occur from 2 to 1
Jun 9 16:21:37 trixbox kernel: buffer re-sync occur from 1 to 0
Jun 9 17:10:59 trixbox kernel: buffer re-sync occur from 0 to 3
Jun 9 17:13:46 trixbox kernel: buffer re-sync occur from 3 to 2
Jun 9 17:13:58 trixbox kernel: buffer re-sync occur from 2 to 1
Jun 9 17:40:53 trixbox kernel: buffer re-sync occur from 1 to 0
Jun 9 18:36:41 trixbox kernel: buffer re-sync occur from 0 to 3
Jun 9 20:04:06 trixbox kernel: buffer re-sync occur from 3 to 2
Jun 9 20:22:39 trixbox kernel: buffer re-sync occur from 2 to 1
Jun 9 21:01:57 trixbox kernel: buffer re-sync occur from 1 to 0
Jun 9 21:02:07 trixbox kernel: buffer re-sync occur from 0 to 2
Jun 9 21:02:09 trixbox kernel: buffer re-sync occur from 2 to 1
Jun 9 21:02:21 trixbox kernel: buffer re-sync occur from 1 to 0
Jun 9 21:03:10 trixbox kernel: buffer re-sync occur from 0 to 3
Jun 9 21:07:05 trixbox kernel: buffer re-sync occur from 3 to 2
Jun 9 21:09:08 trixbox kernel: buffer re-sync occur from 2 to 1
Jun 9 21:09:48 trixbox kernel: buffer re-sync occur from 1 to 0

I've gone as far as disabling hyper-threading and any unused devices and ports (tape drive, USB, etc.). There are no other devices sharing the interrupt:

$ cat /proc/interrupts
CPU0
0: 18737879 IO-APIC-edge timer
1: 9 IO-APIC-edge i8042
2: 0 XT-PIC cascade
6: 5 IO-APIC-edge floppy
8: 1 IO-APIC-edge rtc
12: 114 IO-APIC-edge i8042
14: 167687 IO-APIC-edge ide0
161: 128844 IO-APIC-level eth0
169: 18713693 IO-APIC-level opvxa1200
193: 56364 IO-APIC-level libata
NMI: 0
LOC: 18737550
ERR: 0
MIS: 0


The board itself seems to be generating around 1000 interrupts per second:
$ date; cat /proc/interrupts|grep opvxa1200
Mon Jun 9 21:16:14 EDT 2008
169: 18609880 IO-APIC-level opvxa1200
date; cat /proc/interrupts|grep opvxa1200
Mon Jun 9 21:17:37 EDT 2008
169: 18692558 IO-APIC-level opvxa1200

The buffer re-sync (and an occasional missed-buffer) are causing audible clicks on the channels.

Can you help fix this re-sync issue? Is this a bad board?

Thanks,
Ron[/code]

hello,
Could you post your dmesg message and the result of zap show channels? and to move to other slots?
Regards!
James.zhu

James,

Thanks for the quick response.

The machine has 3 PCI slots and they all act the same way (buffer re-sync).

Requested data below.

Thanks,
Ron

Zap channels:
Asterisk 1.4.18.1-2 RPM by This email address is being protected from spambots. You need JavaScript enabled to view it., Copyright (C) 1999 - 2008 Digium, Inc. and others.
Created by Mark Spencer <This email address is being protected from spambots. You need JavaScript enabled to view it.>
Asterisk comes with ABSOLUTELY NO WARRANTY; type 'core show warranty' for details.
This is free software, with components licensed under the GNU General Public
License version 2 and other licenses; you are welcome to redistribute it under
certain conditions. Type 'core show license' for details.
=========================================================================
Connected to Asterisk 1.4.18.1-2 RPM by This email address is being protected from spambots. You need JavaScript enabled to view it. currently running on trixbox (pid = 19503)
Verbosity is at least 1
trixbox*CLI> zap show channels
Chan Extension Context Language MOH Interpret
pseudo default en default
1 from-internal en default
2 from-internal en default
3 from-internal en default
4 from-internal en default
5 from-internal en default
6 from-zaptel en default
7 from-zaptel en default
8 from-zaptel en default
trixbox*CLI>

dmesg:
Linux version 2.6.18-53.1.4.el5 (This email address is being protected from spambots. You need JavaScript enabled to view it.) (gcc version 4.1.2 20070626 (Red Hat 4.1.2-14)) #1 SMP Fri Nov 30 00:45:16 EST 2007
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 000000003f68cc00 (usable)
BIOS-e820: 000000003f68cc00 - 000000003f68ec00 (ACPI NVS)
BIOS-e820: 000000003f68ec00 - 000000003f690c00 (ACPI data)
BIOS-e820: 000000003f690c00 - 0000000040000000 (reserved)
BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
BIOS-e820: 00000000fec00000 - 00000000fed00400 (reserved)
BIOS-e820: 00000000fed20000 - 00000000feda0000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
118MB HIGHMEM available.
896MB LOWMEM available.
found SMP MP-table at 000fe710
Memory for crash kernel (0x0 to 0x0) notwithin permissible range
disabling kdump
Using x86 segment limits to approximate NX protection
On node 0 totalpages: 259724
DMA zone: 4096 pages, LIFO batch:0
Normal zone: 225280 pages, LIFO batch:31
HighMem zone: 30348 pages, LIFO batch:7
DMI 2.3 present.
Using APIC driver default
Intel MultiProcessor Specification v1.4
Virtual Wire compatibility mode.
OEM ID: DELL Product ID: PE SC420 APIC at: 0xFEE00000
Processor #0 15:3 APIC version 20
I/O APIC #8 Version 32 at 0xFEC00000.
Enabling APIC mode: Flat. Using 1 I/O APICs
Processors: 1
Allocating PCI resources starting at 50000000 (gap: 40000000:a0000000)
Detected 2793.116 MHz processor.
Built 1 zonelists. Total pages: 259724
Kernel command line: ro root=LABEL=/ acpi=off
mapped APIC to ffffd000 (fee00000)
mapped IOAPIC to ffffc000 (fec00000)
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
CPU 0 irqstacks, hard=c0743000 soft=c0723000
PID hash table entries: 4096 (order: 12, 16384 bytes)
Console: colour VGA+ 80x25
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 1022772k/1038896k available (2080k kernel code, 15352k reserved, 869k data, 220k init, 121392k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 5589.09 BogoMIPS (lpj=2794549)
Security Framework v1.0.0 initialized
SELinux: Initializing.
SELinux: Starting in permissive mode
selinux_register_security: Registering secondary module capability
Capability LSM initialized as secondary
Mount-cache hash table entries: 512
CPU: After generic identify, caps: bfebfbff 00000000 00000000 00000000 0000441d 00000000 00000000
CPU: After vendor identify, caps: bfebfbff 00000000 00000000 00000000 0000441d 00000000 00000000
monitor/mwait feature present.
using mwait in idle threads.
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 1024K
CPU: Physical Processor ID: 0
CPU: After all inits, caps: bfebf3ff 00000000 00000000 00000180 0000441d 00000000 00000000
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU0: Intel P4/Xeon Extended MCE MSRs (12) available
CPU0: Thermal monitoring enabled
Checking 'hlt' instruction... OK.
SMP alternatives: switching to UP code
Freeing SMP alternatives: 14k freed
CPU0: Intel(R) Pentium(R) 4 CPU 2.80GHz stepping 04
Total of 1 processors activated (5589.09 BogoMIPS).
ExtINT not setup in hardware but reported by MP table
ENABLING IO-APIC IRQs
..TIMER: vector=0x31 apic1=0 pin1=2 apic2=0 pin2=0
Brought up 1 CPUs
sizeof(vma)=84 bytes
sizeof(page)=32 bytes
sizeof(inode)=340 bytes
sizeof(dentry)=136 bytes
sizeof(ext3inode)=492 bytes
sizeof(buffer_head)=52 bytes
sizeof(skbuff)=172 bytes
checking if image is initramfs... it is
Freeing initrd memory: 2373k freed
NET: Registered protocol family 16
ACPI Exception (utmutex-0262): AE_BAD_PARAMETER, Thread C18DEAA0 could not acquire Mutex [2] [20060707]
ACPI Exception (utmutex-0262): AE_BAD_PARAMETER, Thread C18DEAA0 could not acquire Mutex [2] [20060707]
PCI: PCI BIOS revision 2.10 entry at 0xfb344, last bus=4
PCI: Using configuration type 1
Setting up standard PCI resources
ACPI: Interpreter disabled.
Linux Plug and Play Support v0.97 (c) Adam Belay
pnp: PnP ACPI: disabled
usbcore: registered new driver usbfs
usbcore: registered new driver hub
PCI: Probing PCI hardware
PCI: Probing PCI hardware (bus 00)
Boot video device is 0000:00:02.0
PCI quirk: region 0800-087f claimed by ICH6 ACPI/GPIO/TCO
PCI quirk: region 0880-08bf claimed by ICH6 GPIO
PCI: Ignoring BAR0-3 of IDE controller 0000:00:1f.1
PCI: Transparent bridge - 0000:00:1e.0
PCI: Using IRQ router PIIX/ICH [8086/2640] at 0000:00:1f.0
PCI->APIC IRQ transform: 0000:00:1f.1[A] -> IRQ 161
PCI->APIC IRQ transform: 0000:00:1f.2[C] -> IRQ 193
PCI->APIC IRQ transform: 0000:00:1f.3 -> IRQ 169
PCI->APIC IRQ transform: 0000:02:00.0[A] -> IRQ 161
PCI->APIC IRQ transform: 0000:04:01.0[A] -> IRQ 169
NetLabel: Initializing
NetLabel: domain hash size = 128
NetLabel: protocols = UNLABELED CIPSOv4
NetLabel: unlabeled traffic allowed by default
PCI: Ignore bogus resource 6 [0] of 0000:00:02.0
PCI: Bridge: 0000:00:01.0
IO window: disabled.
MEM window: dfe00000-dfefffff
PREFETCH window: disabled.
PCI: Bridge: 0000:00:1c.0
IO window: disabled.
MEM window: dfd00000-dfdfffff
PREFETCH window: disabled.
PCI: Bridge: 0000:00:1c.1
IO window: disabled.
MEM window: dfc00000-dfcfffff
PREFETCH window: disabled.
PCI: Bridge: 0000:00:1e.0
IO window: d000-dfff
MEM window: dfb00000-dfbfffff
PREFETCH window: disabled.
PCI: Setting latency timer of device 0000:00:01.0 to 64
PCI: Setting latency timer of device 0000:00:1c.0 to 64
PCI: Setting latency timer of device 0000:00:1c.1 to 64
PCI: Setting latency timer of device 0000:00:1e.0 to 64
NET: Registered protocol family 2
IP route cache hash table entries: 32768 (order: 5, 131072 bytes)
TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
TCP bind hash table entries: 65536 (order: 7, 524288 bytes)
TCP: Hash tables configured (established 131072 bind 65536)
TCP reno registered
apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16ac)
audit: initializing netlink socket (disabled)
audit(1213041944.621:1): initialized
highmem bounce pool size: 64 pages
Total HugeTLB memory allocated, 0
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
SELinux: Registering netfilter hooks
Initializing Cryptographic API
ksign: Installing public key data
Loading keyring
- Added public key EE0941287449EA77
- User ID: CentOS (Kernel Module GPG key)
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
PCI: Setting latency timer of device 0000:00:01.0 to 64
assign_interrupt_mode Found MSI capability
Allocate Port Service[0000:00:01.0]
PCI: Setting latency timer of device 0000:00:1c.0 to 64
assign_interrupt_mode Found MSI capability
Allocate Port Service[0000:00:1c.0]
Allocate Port Service[0000:00:1c.0]
PCI: Setting latency timer of device 0000:00:1c.1 to 64
assign_interrupt_mode Found MSI capability
Allocate Port Service[0000:00:1c.1]
Allocate Port Service[0000:00:1c.1]
pci_hotplug: PCI Hot Plug PCI Core version: 0.5
Real Time Clock Driver v1.12ac
Non-volatile memory driver v1.2
Linux agpgart interface v0.101 (c) Dave Jones
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
RAMDISK driver initialized: 16 RAM disks of 16384K size 4096 blocksize
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
ICH6: IDE controller at PCI slot 0000:00:1f.1
ICH6: chipset revision 3
ICH6: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:pio
Probing IDE interface ide0...
hda: TSST CD-RW/DVD-ROM TSH492B, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
Probing IDE interface ide1...
ide-floppy driver 0.99.newide
usbcore: registered new driver hiddev
usbcore: registered new driver usbhid
drivers/usb/input/hid-core.c: v2.6:USB HID core driver
PNP: No PS/2 controller found. Probing ports directly.
serio: i8042 KBD port at 0x60,0x64 irq 1
serio: i8042 AUX port at 0x60,0x64 irq 12
mice: PS/2 mouse device common for all mice
md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: bitmap version 4.39
TCP bic registered
Initializing IPsec netlink socket
NET: Registered protocol family 1
NET: Registered protocol family 17
Using IPI No-Shortcut mode
Freeing unused kernel memory: 220k freed
Write protecting the kernel read-only data: 388k
Time: tsc clocksource has been installed.
input: AT Translated Set 2 keyboard as /class/input/input0
USB Universal Host Controller Interface driver v3.0
ohci_hcd: 2005 April 22 USB 1.1 'Open' Host Controller (OHCI) Driver (PCI)
SCSI subsystem initialized
libata version 2.21 loaded.
ata_piix 0000:00:1f.2: version 2.11
ata_piix 0000:00:1f.2: MAP [ P0 P2 P1 P3 ]
PCI: Setting latency timer of device 0000:00:1f.2 to 64
scsi0 : ata_piix
scsi1 : ata_piix
ata1: SATA max UDMA/133 cmd 0x0001fe00 ctl 0x0001fe12 bmdma 0x0001fea0 irq 193
ata2: SATA max UDMA/133 cmd 0x0001fe20 ctl 0x0001fe32 bmdma 0x0001fea8 irq 193
ata1.00: ATA-7: Maxtor 6Y080M0, YAR51HW0, max UDMA/133
ata1.00: 156250000 sectors, multi 0: LBA
ata1.00: configured for UDMA/133
input: ImPS/2 Generic Wheel Mouse as /class/input/input1
ata2.00: ATA-7: Maxtor 6Y080M0, YAR51HW0, max UDMA/133
ata2.00: 156250000 sectors, multi 0: LBA
ata2.00: configured for UDMA/133
Vendor: ATA Model: Maxtor 6Y080M0 Rev: YAR5
Type: Direct-Access ANSI SCSI revision: 05
SCSI device sda: 156250000 512-byte hdwr sectors (80000 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
SCSI device sda: 156250000 512-byte hdwr sectors (80000 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
sda: sda1 sda2 sda3
sd 0:0:0:0: Attached scsi disk sda
Vendor: ATA Model: Maxtor 6Y080M0 Rev: YAR5
Type: Direct-Access ANSI SCSI revision: 05
SCSI device sdb: 156250000 512-byte hdwr sectors (80000 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 3a 00 00
SCSI device sdb: drive cache: write back
SCSI device sdb: 156250000 512-byte hdwr sectors (80000 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 3a 00 00
SCSI device sdb: drive cache: write back
sdb: sdb1 sdb2 sdb3
sd 1:0:0:0: Attached scsi disk sdb
device-mapper: ioctl: 4.11.0-ioctl (2006-09-14) initialised: This email address is being protected from spambots. You need JavaScript enabled to view it.
kjournald starting. Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
SELinux: Disabled at runtime.
SELinux: Unregistering netfilter hooks
audit(1213041951.988:2): selinux=0 auid=4294967295
intel_rng: Firmware space is locked read-only. <4>intel_rng: If you can't or
don't want to <4>intel_rng: disable this in firmware setup, and <4>intel_rng: if
you are certain that your <4>intel_rng: system has a functional
RNG, try<4>intel_rng: using the 'no_fwh_detect' option.
tg3.c:v3.80-rh (August 2, 2007)
PCI: Setting latency timer of device 0000:02:00.0 to 64
input: PC Speaker as /class/input/input2
eth0: Tigon3 [partno(BCM95751) rev 4001 PHY(5750)] (PCI Express) 10/100/1000Base-T Ethernet 00:11:11:c3:fd:ad
eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] WireSpeed[1] TSOcap[1]
eth0: dma_rwctrl[76180000] dma_mask[64-bit]
hda: ATAPI 48X DVD-ROM CD-R/RW drive, 2048kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.20
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
Open Source Line Echo Canceller Installed
zaptel: no version for "oslec_echo_can_traintap" found: kernel tainted.
Zapata Telephony Interface Registered on major 196
Zaptel Version: 1.4.9.2
OpenVox A1200P version: 1.2
OpenVox A1200P passed register test
Module 0: Installed -- AUTO FXS/DPO
Module 1: Installed -- AUTO FXS/DPO
Module 2: Installed -- AUTO FXS/DPO
Module 3: Installed -- AUTO FXS/DPO
Module 4: Installed -- AUTO FXS/DPO
Module 5: Installed -- AUTO FXO (FCC mode)
Module 6: Installed -- AUTO FXO (FCC mode)
Module 7: Installed -- AUTO FXO (FCC mode)
Module 8: Not installed
Module 9: Not installed
Module 10: Not installed
Module 11: Not installed
Found a OpenVox A1200P: Version 1.2 (8 modules)
buffer re-sync occur from 0 to 3
sd 0:0:0:0: Attached scsi generic sg0 type 0
sd 1:0:0:0: Attached scsi generic sg1 type 0
lp: driver loaded but no devices found
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
device-mapper: multipath: version 1.0.5 loaded
EXT3 FS on sdb2, internal journal
kjournald starting. Commit interval 5 seconds
EXT3 FS on sda1, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
Adding 779144k swap on /dev/sda3. Priority:-1 extents:1 across:779144k
IA-32 Microcode Update Driver: v1.14a <This email address is being protected from spambots. You need JavaScript enabled to view it.>
microcode: CPU0 updated from revision 0x13 to 0x17, date = 04212005
Registered Tormenta2 PCI
usbcore: registered new driver wcusb
Wildcard USB FXS Interface driver registered
INFO-xpp: revision trunk-r5254 MAX_XPDS=64 (8*
INFO-xpp: FEATURE: without BRISTUFF support
INFO-xpp: FEATURE: with PROTOCOL_DEBUG
INFO-xpp: FEATURE: with ECHO_SUPPRESSION
INFO-xpp: FEATURE: without XPP_EC_CHUNK
INFO-xpp: FEATURE: with sync_tick() from ZAPTEL
INFO-xpp_usb: revision trunk-r5254 [sizeof(uframe)=180]
usbcore: registered new driver xpp_usb
Registered tone zone 0 (United States / North America)
tg3: eth0: Link is up at 100 Mbps, full duplex.
tg3: eth0: Flow control is on for TX and on for RX.
buffer re-sync occur from 3 to 2
buffer re-sync occur from 2 to 1
NET: Registered protocol family 10
lo: Disabled Privacy Extensions
IPv6 over IPv4 tunneling driver
buffer re-sync occur from 1 to 0
eth0: no IPv6 routers present
buffer re-sync occur from 0 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 3
buffer re-sync occur from 3 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 3
buffer re-sync occur from 3 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 3
buffer re-sync occur from 3 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 3
buffer re-sync occur from 3 to 1
buffer re-sync occur from 1 to 3
buffer re-sync occur from 3 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 3
buffer re-sync occur from 3 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 3
buffer re-sync occur from 3 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 3
buffer re-sync occur from 3 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 3
buffer re-sync occur from 3 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 3
buffer re-sync occur from 3 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 0
buffer re-sync occur from 0 to 3
buffer re-sync occur from 3 to 2
buffer re-sync occur from 2 to 1
buffer re-sync occur from 1 to 3

please send ssh account to This email address is being protected from spambots. You need JavaScript enabled to view it.

an ssh account is a bit difficult to set up as the trixbox machine is behind another firewall

is there any other way that i can assist in debugging the issue?

the clicking noises are unbearable and the buffer re-sync messages increase severely in frequency with an actual call taking place.

hi:
i think the problem related with hardware.
if you use trixbox, i suggest you checking the certified-hardware:
These Dell servers have been certified for trixbox CE and Pro.

* Dell PowerEdge 1950 Series III
(PERC 6/i)
* Dell PowerEdge 1950
(PERC 5/i)
* Dell PowerEdge 860
* Dell PowerEdge SC440
* Dell Optiplex 330

the url is from :http://trixbox.org/partners/certified-hardware
Regards!
James.zhu