Patton Smartnode Not playing busy promt on outbound busy calls (ISDN)

when making an outbound call and the person you are calling is busy/engaged on another call, your phone will just hang up the call without any indication to the person being busy.

To get an audible busy, please disable the 'eary-disconnect' option from the 3CX SIP interfaces on the Patton.

   Telephony -> Call Router -> Interfaces -> SIP <interfaces>

Also ensure DSS1 is set as the ISDN protocol on the E1/T1 interface.

also pleasse check wiithin 3CX management Console > Settings > Generial "Tab Global Options" Play busy prompt when extension is busy is tcked.
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