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Revise FXS Adapter recommendations and details

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Updated FXS Adapter section with specific device testing results.
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Seth 2026-06-09 09:56:11 -07:00 committed by GitHub
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README.md
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@ -23,7 +23,9 @@ alarmreceiver.conf:
* eventcmd = /usr/local/bin/asteriskcontactid.pl
* eventspooldir = /var/spool/asterisk/alarmreceiver
## Recommended FXS Adapter
The Grandstream HT802 configured for DTMF inband and passthrough is recommended for connecting a Contact ID dialer to Asterisk.
## FXS Adapter
This has been tested with a Grandstream HT802 and an Adtran Total Access 904 configured for DTMF inband and passthrough to connect a Contact ID dialer to Asterisk.
* https://www.grandstream.com/products/gateways-and-atas/analog-telephone-adaptors/product/ht802
Some newer Contact ID dialers may be more strict abut the quality of tones generated by the FXS device. In testing the HT802 worked well with a Silent Knight 5700 FACP, but a newer 6820 FACP would not recognize the kissoff tone through the Grandstream. Replacing it with an Adtran Total Access 904 fixed the issue.