Inband messaging system interface of a PBX
AssigneeRolm Company
InventorZafar M. Khalid
Life of this patent
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Abstract
A method for responding to a call to a called associated with a private branch exchange ("PBX") which is connected to a central office ("CO") by direct inward dial ("DID") trunks, which PBX is connected to a messaging system, the method includes the steps of: (a) responding to the call from the calling party and receiving the called address information; (b) determining whether to forward the call to the messaging system; (c) forwarding the call to the messaging system and transmitting the address information to the messaging system over a line; (d) detecting whether loop current is present or absent from the line after a predetermined interval; (e) if loop current is present, transmitting an answer signal to the CO, and (f) if loop current is absent, transmitting an identifying tone to the CO.
Claims7
A method for responding to a call to a called number associated with a private branch exchange ("PBX") which is connected to a central office ("CO"), which PBX is connected to a messaging system, the method comprising the steps of:
- responding to the call from the calling party and receiving the called address information;
- determining whether to forward the call to the messaging system;
- forwarding the call to the messaging system and transmitting the address information to the messaging system over a line;
- detecting whether loop current is present or absent from the line after a predetermined and programmable time after the address information has been transmitted to the messaging system;
- if loop current is present, transmitting an answer signal to the CO;
- and
- if loop current is absent transmitting an identifying tone to the CO, said identifying tone being indicative of a call that was not connected.
A method for responding to a call to a called number associated with a private branch exchange ("PBX") which is connected to a central office ("CO"), which PBX is connected to a messaging system, the method comprising the steps of:
- responding to the call from the calling party and receiving the called station address information;
- determining whether to forward the call to the messaging system;
- forwarding the call to the messaging system and transmitting the address information to the messaging system over a line;
- detecting whether loop current is present or absent from the line;
- if loop current is present, transmitting an answer signal to the CO;
- and
- if loop current is absent, transmitting an identifying tone to the CO, wherein the identifying tone is reorder tone.
A method for responding to a call to a called number associated with a private branch exchange ("PBX") which PBX is connected to a messaging system, the method comprising the steps of:
- responding to the call from calling party and receiving the called number address information;
- determining whether to forward the call to the messaging system;
- forwarding the call to the messaging system and transmitting the address information to the messaging system over a line;
- detecting whether loop current is present or absent from the line after the address information has been transmitted to the messaging system;
- if loop current is present, connecting the calling party with the messaging system;
- and
- if loop current is absent, transmitting an identifying tone to the calling party, said identifying tone being indicative of a call that could not be connected to the called number.
A method for responding to a call to a called number associated with a private branch exchange ("PBX") which PBX is connected to a messaging system, the method comprising the steps of:
- responding to the call from calling party and receiving the called number address information;
- determining whether to forward the call to the messaging system;
- forwarding the call to the messaging system and transmitting the address information to the messaging system over a line;
- detecting whether loop current is present or absent from the line;
- if loop current is present, connecting the calling party with the messaging system;
- and
- if loop current is absent, transmitting an identifying tone to the calling party, wherein the identifying tone is an Internal Reorder Tone.
A method for responding to a call to a called number associated with a private branch exchange ("PBX") which is connected to a central office ("CO"), which PBX is connected to a messaging system, the method comprising the steps of:
- responding to the call from the calling party and receiving the called address information;
- determining whether to forward the call to the messaging system;
- forwarding the call to the messaging system and transmitting the address information to the messaging system over a line;
- detecting whether loop current is present or absent from the line;
- if loop current is present, transmitting an answer signal to the CO;
- and
- if loop current is absent, transmitting an identifying tone to the CO, wherein the identifying tone is busy tone.
A method for responding to a call to a called number associated with a private branch exchange ("PBX") which PBX is connected to a messaging system, the method comprising the steps of:
- responding to the call from calling party and receiving the called number address information;
- determining whether to forward the call to the messaging system;
- forwarding the call to the messaging system and transmitting the address information to the messaging system over a line;
- detecting whether loop current is present or absent from the line;
- if loop current is present, connecting the calling party with the messaging system;
- and
- if loop current is absent, transmitting an identifying tone to the calling party, wherein the identifying tone is busy tone.
Dependencies are inferred from the claim text.