Network device and method for a universal central exchange

A method of a universal central exchange (Centrex), the method comprising:

• receiving, by a processor (202) associated with a network device (102), a short code dialed by a first user from at least one of,
• a first user device (110) to a second user device (110),
• the second user device (110) to the second user device (110), and
• Inter/Intra circle first user device (110) used by the first user, wherein the second user device (110) is a single device distinct from the first user device (110) and is communicatively coupled to one or more Internet Protocol Private Branch Exchange (IP PBX) (504);
• determining, by the processor (202), if the received short code is at least one of a SIP trunking code or an IP Centrix/Centrex code;
• converting, by the processor (202), the received short code to a relevant Uniform Resource Identifier (URI) corresponding to the at least one of a SIP trunking code or an IP Centrix/Centrex code, based on the determination, wherein the short code corresponds to at least one of a fixed-line and a mobile number;
• for the URI, performing, by the processor (202), at least one of an:
• E. 164 number to URI mapping (ENUM) and a Mobile Number Portability (MNP);
• transmitting, by the processor (202), a SIP INVITE request for inviting a second user associated with at least one of the first user devices (110) for a session, wherein the SIP INVITE comprises a URI address along with a domain name associated with the second user;
• transmitting, by the processor (202), a Caller Ring Back Tones (CRBT) (406) to the first user, while ringing the second user associated with at least one of the first user devices (110), and the second user device (110), upon receiving a SIP INVITE response from the second user;
• and
• processing, by the processor (202), a call between the first user and the second user, based on receiving the call by the second user, after ringing the second user associated with at least one of the first user devices (110), and the second user device (110).

A user equipment (110) for a universal central exchange, the user equipment (110) comprising:

• a processor coupled to a processor (202) of a network device (102);
• and
• a memory coupled to the processor, wherein the memory comprises processor-executable instructions, which on execution, cause the user equipment (110) to:
• transmit a short code dialed by a first user associated with the user equipment (110) to a second user associated with a second user equipment, wherein the second user equipment is communicatively coupled to one or more Internet Protocol Private Branch Exchange (IP PBX) (504);
• receive a Caller Ring Back Tone (CRBT) (406);
• and
• process a call between the first user and the second user.

A non-transitory computer-readable medium comprising processor-executable instructions that cause a processor to:

• receive a short code dialed by a first user from at least one of:
• a first user device (110) to a second user device (110),
• the second user device (110) to the second user device (110), and
• Inter/Intra circle of the first user device (110) used by the first user, wherein the second user device (110) is a single device distinct from the first user device (110) and is communicatively coupled to one or more Internet Protocol Private Branch Exchange (IP PBX) (504);
• determine if the received short code is at least one of:
• a Session Initiation Protocol (SIP) trunking code or an Internet Protocol (IP) Centrix/Centrex code;
• convert the received short code to a relevant Uniform Resource Identifier (URI) corresponding to the at least one of:
• the SIP trunking code or the IP Centrix/Centrex code, based on the determination, wherein the short code corresponds to at least one of:
• a fixed line and a mobile number;
• for the URI, perform at least one of:
• an E. 164 number to URI mapping (ENUM) and a Mobile Number Portability (MNP);
• transmit an SIP INVITE request for inviting a second user to associate with at least one of the first user devices (110) for a session, wherein the SIP INVITE comprises a URI address along with domain name associated with the second user;
• transmit a Caller Ring Back Tone (CRBT) (406) to the first user, while ringing the second user associated with at least one of the first user device (110) and the second user device (110), upon receiving an SIP INVITE response from the second user;
• and
• process a call between the first user and the second user, based on receiving the call by the second user, after ringing the second user associated with at least one of the first user device (110) and the second user device (110).