Hey guys! I just received and installed the ATM4U (universal - newer card than what I had) and its good! Came right up as an analog trunk interface. So, I am a few short minutes away from having my home office phone system back in business. Thanks for all the help on the forum! I did an erase config/erasenvconfig and a reboot - here is the latest config print. There are some additional things I notice in here, like the ATM4 modem installed, and the echo cancellation entries. Hopefully that won't interfere with it working correctly with plain old POTS trunks. Guess I will find out!
Cheers!
AT
OK
AT-DEBUG
<IPOffice Manager Version 0.2>
Mon 8/9/2014 15:32:08, Hello>eraseconfig
Mon 8/9/2014 15:32:16, Hello>erasenvconfig
Mon 8/9/2014 15:32:27, Hello>reboot
Shut down the call system ...
Shut down the call system ... Unregister H323 Phones
Shut down the call system ... Remove all VPN Calls
Shut down the call system ... closing TCP Services
Closed Services (total: 7) ... closing down TCP clients (total: 0)
Expanding MPPC image ...
LOOPTEST
Alarm Logging enabled (max entries=8, in use=0)
Audit Logging enabled (max entries=31, in use=21)
NoCacheStaticHeap=4007332 NoCacheDynamicHeap=326236 Overflow=0
Constructor StaticHeap=10676 DynamicHeap=5789340
Factory Test Status 00000001
Product Variation Status 00000003
Small Office Gateway Status ffffffff
NVConfiguration:: No NV Stored default..
Dummy print %VERSIONINFOSTRING%
found FLASH file: ..\modem\zmbin004.s37, len=790
found FLASH file: ..\modem\mcode.bin, len=40000
found FLASH file: ..\vcomp\48105ak.310, len=e2
found FLASH file: ..\vcomp\48105ae3.312.03, len=1ee4e
found FLASH file: ..\platform\onehz.bin, len=3e80
found FLASH file: ding.pcm, len=40a
found FLASH file: ..\vcomp\482ak.311.09, len=10e
found FLASH file: ..\vcomp\48204ae6.311.09, len=1da6a
DCP interface (Hatric v4) detected
htl 00010000 hth 20600000
SLOT A: No ISDN/AT Module fitted
SLOT B: Analogue Trunk Module 4U Added
AtmDSP::AtmDSPB (base=0x40020000, reset=0x40020c00)
AtmVinetic:

EC(0B): FAILED: Bootload error (0x0001)
AtmVinetic:

ownloadEmbeddedController(0B): OK
AtmVinetic:

ownloadEDSPFirmware(0B): OK
Initialising PCM channel 0
Initialising PCM channel 1
Initialising PCM channel 2
Initialising PCM channel 3
AtmVinetic::RestartCodec(0B): Restart OK
'B' - ATM V42 Modem fitted
DU_SLICOFI2: chip version: V1.5
PotsExpModule created
DownloadHub: &ffe5cecc: port_count=#8.
#0: port=&ffe65d60 renderer=&ffe5dbf0 sequencer=&00000000.
#1: port=&ffe65608 renderer=&ffe5da50 sequencer=&00000000.
#2: port=&ffe64eb0 renderer=&ffe5d8b0 sequencer=&00000000.
#3: port=&ffe64758 renderer=&ffe5d710 sequencer=&00000000.
#4: port=&ffe64000 renderer=&ffe5d570 sequencer=&00000000.
#5: port=&ffe638a8 renderer=&ffe5d3d0 sequencer=&00000000.
#6: port=&ffe63150 renderer=&ffe5d230 sequencer=&00000000.
#7: port=&ffe629f8 renderer=&ffe5d090 sequencer=&00000000.
No Modem fitted
VComp chips detected as 481 (0xff44 read at 0x400800f0)
VComps loading len=126542 MAX=4
Vcomp_PCB0: Found voice compressor 0
Vcomp_PCB0: No voice compressor 1
Vcomp_PCB0: No voice compressor 2
Vcomp_PCB0: No voice compressor 3
VComp_PCB0: Num VComp channels available = 5
Unit warm start = 1
RouteSystem::Attempting DHCP...
DHCP Client State Change Init->Init
DHCP Client State Change Init->Init
DHCP::SendDiscover
Sending DHCP out on LAN1
DHCP::RecvOffer
DHCP Client State Change Selecting->Selecting
DHCP::SendRequest
Requested stuff
Sending DHCP out on LAN1
DHCP::RecvAck
Got Router (4) c0a8fefe
Got DNS (4) c0a8fefe
Got Domain Name netgear.com
DHCP Client State Change Requesting->Requesting
DHCP::Bound T1=43200 T2=75600
RouteSystem:

HCP OK - IP Address C0A8FE18 FFFFFF00
RouteSystem:

HCP - Saving assigned values
RouteSystem:

HCP - Saving new mode: 4, addr: C0A8FE18, mask: FFFFFF00
RouteSystem:: LAN1 ipaddr=C0A8FE18 ipmask=FFFFFF00
Configuration::Attempting to read from FLASH...
FlashConfigIO::Load(0)
Configuration::Using Default...
Diffserve settings - VAL=b8 MASK=fc
DHCP Address LAN1 Changed
DHCP Address LAN2 Changed
Configuration::Complete
Platform:

iscover TDM Attached Units...
Platform:

iscover Possible LAN Attached Units...
Configuration::WARNING Unit IP 403 is not configured - adding
Configuration::WARNING Unit ANALOGUE POTS2 is not configured - adding
Configuration::WARNING Unit DIGITAL DCP 8 is not configured - adding
Firewall Validating LAN1
Checking WAN
Adding RemoteManager route to 192.168.99.0
Configuration::AddCfgIPRoute C0A86300 FFFFFF00 RemoteManager
IPSecMng::Starting IPSec module...
0: PCM=fffff8f4 ALaw=c1
1: PCM=12a9 ALaw=2c
2: PCM=2280 ALaw=1e
3: PCM=2891 ALaw=1b
4: PCM=1e31 ALaw=21
5: PCM=07bb ALaw=3f
6: PCM=fffff434 ALaw=b7
7: PCM=ffffd8db ALaw=9c
8: PCM=ffffd6ee ALaw=9b
9: PCM=ffffe2a5 ALaw=a2
CallSystem::NEW LINE Detected 1
ALOG Line 5 - Permitting Private Modem
Installing ATM V42 SoftModem: DSP: ffe7555c, BChan: 0:1
CallSystem::NEW LINE Detected 2
CallSystem::NEW LINE Detected 3
CallSystem::NEW LINE Detected 4
RasServer::Starting...
Added ACDQueue to Main
Creating default E911 zone...
Updates IO list size 0
Config Write Completed
SetLocale locale=enu
Initialising PCM channel 3
AtmVinetic::SetupNearEndEchoCancelation delay=(16ms), channel=(3)
Initialising PCM channel 2
AtmVinetic::SetupNearEndEchoCancelation delay=(16ms), channel=(2)
Initialising PCM channel 1
AtmVinetic::SetupNearEndEchoCancelation delay=(16ms), channel=(1)
Initialising PCM channel 0
AtmVinetic::SetupNearEndEchoCancelation delay=(16ms), channel=(0)
Initialising PCM channel 3
AtmVinetic::SetupNearEndEchoCancelation delay=(16ms), channel=(3)
Near End EchoCancellation stopped: 0x103
Far End EchoCancellation stopped: 0x103
Initialising PCM channel 2
AtmVinetic::SetupNearEndEchoCancelation delay=(16ms), channel=(2)
Near End EchoCancellation stopped: 0x102
Far End EchoCancellation stopped: 0x102
Initialising PCM channel 1
AtmVinetic::SetupNearEndEchoCancelation delay=(16ms), channel=(1)
Near End EchoCancellation stopped: 0x101
Far End EchoCancellation stopped: 0x101
Initialising PCM channel 0
AtmVinetic::SetupNearEndEchoCancelation delay=(16ms), channel=(0)
Near End EchoCancellation stopped: 0x100
Far End EchoCancellation stopped: 0x100
IPOFFICE: Mon 2014/9/8 15:33:14 FreeMem=4471504
SNMP::Starting SNMP Service...
SNMPTrapper::SNMP Trap Generator bound to UDP src port 4101
Inband Exception Handling Enabled
Initialisation complete starting TA