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How can a FLASH be relayed from an FXS port to the PSTN on an FXO port?
Posted by Elena Brambilla, Last modified by Daniel Lizaola on 12 December 2017 05:12 PM
A common application is to accept calls from a PSTN on an FXO port and then ring a telephone connected to a FXS port. In order to send a FLASH out the FXO port to the PSTN, you must disable all supplementary calling features on the FXS interface. For example:

interface fxs IF-FXS-PHONE1
route call dest-table TAB-OUTGOING-LINE1
no call-hold
no call-waiting
no additional-call-offering
caller-id-presentation mid-ring
use profile tone-set US
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