[asterisk-ss7] BIG Echo on SS7 channels.

[Kevin P. Fleming]

On 08/12/2010 11:51 AM, Jorge Antillon wrote:
> Hi,
> 
> Box1    pci:0000:03:03.0     wct4xxp+     d161:0410 Wildcard TE410P (3rd
> Gen)
> Box2    pci:0000:03:03.0     wanpipe-     1923:0100 Sangoma Technologies
> Corp. A104d QUAD T1/E1 AFT card
> Box3    pci:0000:03:03.0     wct4xxp+     d161:0410 Wildcard TE410P (2nd
> Gen) (OpenVox)
> Box4    pci:0000:03:03.0     wct4xxp+     d161:0410 Wildcard TE410P (2nd
> Gen) (OpenVox)
> Box5    pci:0000:03:03.0     wct4xxp+     d161:0410 Wildcard TE410P (2nd
> Gen) (OpenVox)
> 
> Output of:
> 
> wanrouter hwprobe (for box2)
> 
> 1 . AFT-A104-SH : SLOT=3 : BUS=3 : IRQ=3 : CPU=A : PORT=1 : HWEC=128 : V=25
> 2 . AFT-A104-SH : SLOT=3 : BUS=3 : IRQ=3 : CPU=A : PORT=2 : HWEC=128 : V=25
> 3 . AFT-A104-SH : SLOT=3 : BUS=3 : IRQ=3 : CPU=A : PORT=3 : HWEC=128 : V=25
> 4 . AFT-A104-SH : SLOT=3 : BUS=3 : IRQ=3 : CPU=A : PORT=4 : HWEC=128 : V=25
> 
> output of:
> 
> grep HWEC *
> wanpipe1.conf:TDMV_HWEC = NO
> wanpipe2.conf:TDMV_HWEC = NO
> wanpipe3.conf:TDMV_HWEC = NO
> wanpipe4.conf:TDMV_HWEC = NO
> 
> 
> I am pretty positive there are hw echo cancel boards on box1 and box2,
> but unfortunately I can't remember for sure.

If you don't have hardware echo cancellers, and you don't define a
software echo canceller in /etc/dahdi/system.conf, then it's completely
logical that asking the channel driver to enable echo cancellation will
result in an error message... there's nothing to enable.

Either ensure all your boards have hardware echo cancellers and they are
not disabled, or enable a software echo canceller.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: kfleming at digium.com
Check us out at www.digium.com & www.asterisk.org