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Telephone ISDN can not call out

Hi,

Yeastar S20 (last firmware) with one card ISDN BRI on board.

Trunk BRI1 (Network)

Trunk SIP Register trunk

Inbound Routes: ISDN to SIP,   SIP to ISDN  (Destination: Outbound Route)

Outbound Routes: ToSIP, toISDN

 

I Have a ISDN PBX connected on Bri1 (Or a simply ISDN Phone)

When External user call Sip number, the ISDN Phone Ring and work

When the ISDN Phone call out , i hear Busy tone immediately.

 

How can i resolve ?

Thanks so much

Simone Zerbin

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