For best integration of these products, follow these suggestions:
(8301) Line Output terminals 3,4 ----> (ZPI) Telco In terminals 1,2
(8301) Relay Out terminals 3,4 ----> (ZPI) Input Contacts terminals 9,10
Paging Selection switch - to right (Page)
Talk Battery switch - to left (TB Off)
Algo 8301 Administration page:
Advanced Settings --- Advanced Audio --- "Generate In-Band DTMF Tones" -- Set to Enabled
Basic Settings -- "DTMF Detection Type" -- Set to "RTP Telephony Event (RFC 4733)
This will facilitate the passthrough of DTMF tones the ZPI-4 needs for zone selection and page routing to the appropriate speaker/amplifier zone(s).