Automatic circuit configuration detection in legacy telephone networks

A device comprising:

• a processing system including a processor;
• and
• a memory that stores executable instructions that, when executed by the processing system, facilitate performance of operations comprising:
• determining a plurality of combinations of settings for a session border controller (SBC) installed at a premises in association with primary rate interface (PRI) equipment at the premises, the SBC in communication with a first communication network, and wherein existing settings for the PRI equipment are unknown, and wherein a combination of settings of the plurality of combinations of settings of the SBC is required to coincide with the existing settings for the PRI equipment to enable reliable communication between the SBC and the PRI equipment;
• listing the combinations in an ordered sequence;
• identifying a listed combination that is a combination that coincides with the existing settings of a primary rate interface (PRI) circuit at the premises, forming an identified combination;
• enabling a first connection between a first connection port of the SBC and the PRI circuit and a second connection between a second connection port of the SBC and a second communication network, wherein the first connection is based on the identified combination, wherein settings of the SBC correspond to the identified combination, wherein the SBC comprises a connection between the first connection port and the second connection port;
• and
• subsequently disabling the second connection, resulting in the PRI equipment communicating with the first communication network without a change to the settings of the PRI equipment.

A non-transitory machine-readable medium comprising executable instructions that, when executed by a processing system including a processor, facilitate performance of operations comprising:

• determining a plurality of combinations of settings for a session border controller (SBC) installed at a premises in association with primary rate interface (PRI) equipment at the premises, the SBC in communication with a first communication network, wherein existing settings for the PRI equipment are unknown, and wherein a combination of settings of the plurality of combinations of settings of the SBC is required to coincide with the existing settings for the PRI equipment for compatible communication between the SBC and the PRI equipment;
• listing the combinations in an ordered sequence;
• identifying a listed combination that is a combination that coincides with settings of a primary rate interface (PRI) circuit at the premises, forming an identified combination;
• enabling a first connection between a first connection port of the SBC and the PRI circuit, wherein the first connection is based on the identified combination, and a second connection between a second connection port of the SBC and a second communication network, wherein settings of the SBC correspond to the identified combination, wherein the SBC comprises a connection between the first connection port and the second connection port;
• and
• subsequently disabling the second connection, resulting in PRI equipment communicating with the first communication network without a change to the settings of the PRI equipment.