Telephone interconnection

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Questions ragrading settings for telephone interconnection, PBXs, and organization of phone system with SmartPTT

• SMARTPTT PLUS PHONE CONNECT vs SMARTPTT PLUS SIP-10 (20)
• Sound in phone call is going one way or totally absent
• Radio subscriber cannot initiate/end a phone call
• Radio receives incoming call, but pressing PTT gives "channel busy" signal