asterisk users - Nov 2010 - How to configure a Linksys PAP2T ATA to connect an analog fax machine to Asterisk

I was having problems getting a Linksys PAP2T-NA to work with Pitney
Bowes mailing station so it could use its modem to dial home and
download postage/software updates.  After scowering the web, I
couldn't seem to find a definite how to article on what settings were
needed.  I finally came up some settings by combining the information
from various places around the 'net.  I have typed out those settings
and included them below.

Are there any settings I should configure differently?  Anything I
should add or remove?

I was using a Linksys PAP2T-NA with firmware version 3.1.15(LS), but I
would assume that these settings would be similar on the Sipura
SPA-1001, and the Linksys PAP2, SPA2102, SPA3102 ATAs.

Settings that have an asterisk (*) before them seem to be particularly
important, so please make to pay attention to them.

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SIP (tab)
	RTP Paremeters (section)
		*RTP Packet Size:  0.020 (or 0.010)
	
Line (tab)
	Network Settings (section)
		*Network Jitter Buffer: very high (or extremely high)
		Jitter Buffer Adjustment: disable

	Supplementary Service Subscription (section)
		*Call Waiting Serv: no
		Block ANC Serv: no
		Cfwd All Serv: no
		Cfwd No Ans Serv: no
		Cfwd Last Serv: no
		Accept Last Serv: no
		...
		Call Return Serv: no
		*Three Way Call Serv: no
		...
		Speed Dial Serv: no
		...
		Service Announcement Serv: no
		Block CID Serv: no
		...
		Cfwd Busy Serv: no
		Cfwd Sel Serv: no
		Block Last Serv: no
		DND Serv: no
		...
		Call Back Serv: no
		...
		Secure Call Serv: no

	Audio Configuration (section)
		Preferred Codec: G711a  (or G711u)
		Use Pref Codec Only: yes
		...
		FAX Codec Symmetric: yes
		...
		Hook Flash Tx Method: None
		...
		*Silence Supp: No
		Silence Threshold: medium
		*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 Passthru Method: NSE
		FAX Process NES: yes
		FAX Disable ECAN: yes

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Resources:

<http://www.minigeek.org/2008/03/spa3102-asterisk-and-faxing>

<http://www.voipmechanic.com/voip-fax-settings-linksys.htm>

<http://www.freepbx.org/support/documentation/howtos/how-to-set-up-a-linksys-pap2-or-sipura-spa-2000-for-use-with-freepbx>

<http://legacy.teliax.com/forum/viewtopic.php?t=274>

<http://forum.voxilla.com/cisco-linksys-sipura-voip-support-forum/spa3000-analog-modem-35167.html#post128180>

<http://forum.voxilla.com/broadvoice-support-forum/outbound-fax-not-working-since-outage-last-month-12659.html#post65012>

<http://fonality.com/trixbox/node/24515>



-- 
Andrew Stewart  (dCAP)
astewart at notre1.com