По п.1 - полагаю все дело в том, что канал уже отвечен - попробуйте без Answer.

Вроде без изменений!

питание на Digium подавали? (отдельный провод)

Покажите вывод:

CLI> zap show status

CLI> zap show channels

Питание на плату Digium подовали (разем питания IDE винчестера)

AsteriskPBX*CLI> zap show status
Description Alarms IRQ bpviol CRC4
Wildcard TDM800P Board 1 OK 5 0 0
The 'zap show status' command is deprecated and will be removed in a future release. Please use 'dahdi show status' instead.
AsteriskPBX*CLI> dahdi show status
Description Alarms IRQ bpviol CRC4
Wildcard TDM800P Board 1 OK 5 0 0
AsteriskPBX*CLI>


AsteriskPBX*CLI> zap show channels
Chan Extension Context Language MOH Interpret
pseudo default default
1 from-pstn us default
3 phone us default
4 phone us default
5 phone us default
6 phone us default
The 'zap show channels' command is deprecated and will be removed in a future release. Please use 'dahdi show channels' instead.
AsteriskPBX*CLI> dahdi show channels
Chan Extension Context Language MOH Interpret
pseudo default default
1 from-pstn us default
3 phone us default
4 phone us default
5 phone us default
6 phone us default
AsteriskPBX*CLI>

CLI> zap show status ?

AsteriskPBX*CLI> zap show status
Description Alarms IRQ bpviol CRC4
Wildcard TDM800P Board 1 OK 5 0 0
The 'zap show status' command is deprecated and will be removed in a future release. Please use 'dahdi show status' instead.

AsteriskPBX*CLI> dahdi show status
Description Alarms IRQ bpviol CRC4
Wildcard TDM800P Board 1 OK 5 0 0
AsteriskPBX*CLI>

При входящем звонке:

[Feb 11 17:21:36] NOTICE[7075]: chan_dahdi.c:6525 ss_thread: Got event 18 (Ring Begin)...
[Feb 11 17:21:37] NOTICE[7075]: chan_dahdi.c:6525 ss_thread: Got event 2 (Ring/Answered)...
[Feb 11 17:21:41] NOTICE[7075]: chan_dahdi.c:6525 ss_thread: Got event 18 (Ring Begin)...
[Feb 11 17:21:42] WARNING[7075]: chan_dahdi.c:1473 dahdi_enable_ec: Unable to enable echo cancellation on channel 1 (No such device)

еще вывод: cat /proc/dahdi/1

и что у вас в /etc/dahdi/system.conf?

# cat /proc/dahdi/1
Span 1: WCTDM/0 "Wildcard TDM800P Board 1" (MASTER)
IRQ misses: 5

1 WCTDM/0/0 FXSKS (In use)
2 WCTDM/0/1 RED
3 WCTDM/0/2 FXOKS (In use)
4 WCTDM/0/3 FXOKS (In use)
5 WCTDM/0/4 FXOKS (In use)
6 WCTDM/0/5 FXOKS (In use)
7 WCTDM/0/6
8 WCTDM/0/7

cron333:

и что у вас в /etc/dahdi/system.conf?

# Channel Configuration
# ^^^^^^^^^^^^^^^^^^^^^
fxsks = 1
fxoks = 3-6
defaultzone=us
loadzone=us
Остальное все закоментированное = #

echocanceler установите в /etc/dahdi/system.conf