Interfacing between independent voice mail system and exchange

A method of interfacing an independent voice mail system to an exchange, wherein said exchange, a serial transmission interface and said independent voice mail system are positioned serially, said method comprising the steps of:

• receiving from a subscriber of said exchange a request for a call message to be transmitted to said independent voice mail system;
• detecting the presence of a port for the formation of a communication path in said independent voice mail system;
• transmitting said call message to said independent voice mail system via said serial transmission interface if it has been detected in said detecting step that a port for the formation of a communication path is present;
• and
• performing an operation of said independent voice mail system having received said call message based on said call message.

A method of interfacing an independent voice mail system to an exchange, wherein said exchange, a serial transmission interface and said independent voice mail system are positioned serially, said method comprising the steps of:

• receiving from an extension line subscriber of said exchange a request for a call message to be transmitted to said independent voice mail system;
• detecting the presence of a port for the formation of a communication path in said independent voice mail system;
• transmitting said call message to said independent voice mail system via said serial transmission interface if it has been detected in said detecting step that a port for the formation of a communication path is present;
• and
• performing an operation of said independent voice mail system having received said call message based on said call message.

A method of interfacing an independent voice mail system to an exchange, wherein said exchange, a serial transmission interface and said independent voice mail system are positioned serially, said method comprising the steps of:

• receiving from an office line subscriber of said exchange a request for a call message to be transmitted to said independent voice mail system;
• detecting the presence of a port for the formation of a communication path in said independent voice mail system;
• transmitting said call message to said independent voice mail system via said serial transmission interface if it has been detected in said detecting step that a port for the formation of a communication path is present;
• and
• performing an operation of said independent voice mail system having received said call message based on said call message.

A method of interfacing an independent voice mail system to an exchange, wherein said exchange, a serial transmission interface and said independent voice mail system are positioned serially, said method comprising the steps of

• receiving from an office line subscriber of said exchange a directly dialed request for a call message to be transmitted to said independent voice mail system;
• detecting the presence of a port for the formation of a communication path in said independent voice mail system;
• transmitting said call message to said independent voice mail system via said serial transmission interface if it has been detected in said detecting step that a port for the formation of a communication path is present;
• and
• performing an operation of said independent voice mail system having received said call message based on said call message.

A method of interfacing an independent voice mail system to an exchange, wherein said exchange, a serial transmission interface and said independent voice mail system are positioned serially, said method comprising the steps of:

• receiving from a specific called party, one of a plurality of extension line subscribers of said exchange, a request for setting a reception switching mode in said independent voice mail system;
• receiving from an extension line subscriber of said exchange a request for a call message to be transmitted to said specific called party;
• detecting the presence of a port for the formation of a communication path in said independent voice mail system;
• transmitting said call message to said independent voice mail system via said serial transmission interface if it has been detected in said detecting step that a port for the formation of a communication path is present;
• and
• performing an operation of said independent voice mail system having received said call message based on said call message.