adsi.conf
The Analog Display Services Interface (ADSI) was designed to allow telephone companies to deliver enhanced services across analog telephone circuits. In Asterisk, you can use this file to send ADSI commands to compatible telephones. Please note that the phone must be directly connected to a Zapata channel. ADSI messages cannot be sent across a VoIP connection to a remote analog phone.
The res_adsi.so module is required for the
Voicemail() application; however, the
adsi.conf file is not necessarily used. Detailed
information about ADSI is not publicly available, and documentation
needs to be purchased from Telcordia.
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