On 09/25/2012 10:34 AM, Sylvain Rochet wrote:
Hi Jeff,
On Tue, Sep 25, 2012 at 10:11:27AM -0500, Jeff LaCoursiere wrote:
Aha! That is what I am looking for. What firmware rev are you
using on the 3102?
5.1.12 on SPA8000, 5.1.10(GW) on SPA3102, there is probably new releases
from Cisco, at the time I builded the T.38 network those were the latest
releases.
Here is my SPA3102 configuration that I changed or are relevant to FAX/T.38:
Network Jitter Level: very high
Jitter Buffer Adjustment: disable
Call Waiting Serv: no
Three Way Conf Serv: no
Echo Canc Enable: no
Echo Canc Adapt Enable: no
Echo Supp Enable: no
FAX CED Detect Enable: yes
FAX CNG Detect Enable: yes
FAX Passthru Codec: G711a
FAX Codec Symmetric: yes
FAX Passthru Method: NSE
DTMF Tx Mode: Normal
FAX Process NSE: yes
FAX Disable ECAN: yes
FAX Enable T38: yes
FAX Tone Detect Mode: caller or callee
Note that my Asterisk is also configured to do Fax Tone Detect and ask
my ATA to switch to T.38 before my ATA ask Asterisk to do so, thereforce
I don't know if ATA Fax Tone Detection work correctly.
So if I am parsing you correctly, the asterisk server the ATA is
registered to is *also* a T.38 gateway, as you have directly connected
ISDN?
Yes, this is also a T.38 gateway, my goal was to use T.38 from my ATA to
Asterisk over my non-isochronous IP network. T.38 gateway is supported
since Asterisk >= 10 and you don't need it since you are doing T.38
passthru, but you need a device somewhere on the path able to detect the
FAX preamble and ask to switch the data channel from ulaw/alaw to T.38.
Sylvain
Thanks for the info Sylvain, that is just what I was looking for. Hoping
to find that a lower model has the same feature set (don't really need
the FXO port)... I am playing with an SPA122 right now, which seems to
have the same options available you mention above. I'll load the latest
firmware and report my experiences for posterity.
Cheers,
j
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