Cloud-based call routing

1 . A method comprising:

dynamically determining, at call setup, a routing path for a call based on a real-time synchronized unified directory that maps extensions and numbers across native devices and non-native devices, wherein the unified directory is updated in real-time as unified directory mappings change;

routing the call from a first device associated with a first carrier of a network through a private branch exchange (PBX) via an internet gateway configured to communicate directly with the first device;

routing the call from a session border controller (SBC) communicatively coupled to the PBX via a session initiation protocol (SIP) trunk based on the determined routing, wherein the SBC is an intermediary that dynamically routes calls between the native devices and the non-native devices based on the unified directory; and

routing the call to a second device associated with a second carrier of the network via a call manager associated with the second carrier.

2 . The method of claim 1 , further comprising:

routing the call from the SBC to a native public switched telephone network (PSTN) when the call is destined for an external device that is not associated with the network.

3 . The method of claim 1 , wherein the second device is a native device associated with the network.

4 . The method of claim 1 , wherein the PBX is a cloud-based PBX.

5 . The method of claim 1 , wherein the second device is a voice-over-internet protocol (VoIP) device.

6 . A system, comprising:

a network associated with a first carrier and a second carrier, the network comprising:

a first device associated with the first carrier and configured to communicate with a telephone gateway; and

a second device associated with the second carrier and configured to communicate directly with an internet gateway; and

a telephony server associated with the second carrier configured to dynamically determine, at call setup, a routing path for a call based on a real-time synchronized unified directory that maps extensions and numbers across native devices and non-native devices, wherein the unified directory is updated in real-time as unified directory mappings change, the telephony server comprising:

a private branch exchange (PBX) configured to route the call from the second device via the internet gateway;

a session border controller (SBC) communicatively coupled to the PBX and configured to route the call via a session initiation protocol (SIP) trunk based on the determined routing, wherein the SBC is an intermediary that dynamically routes calls between the native devices and the non-native devices based on the unified directory; and

a call manager configured to route the call to the first device.

7 . The system of claim 6 , wherein the PBX is a cloud-based PBX system.

8 . The system of claim 6 , wherein the first device is a non-voice-over-internet protocol (VoIP) device.

9 . The system of claim 6 , wherein the second device is a voice-over-internet protocol (VoIP) device.

10 . The system of claim 6 , wherein the network further comprises a first data store configured to store first device extensions of non-native devices associated with the network.

11 . The system of claim 10 , wherein the telephony server further comprises a second data store configured to store second device extensions of native devices associated with the network.

12 . The system of claim 11 , wherein the second data store is configured to synchronize data with the first data store to create the unified directory to manage the non-native devices and the native devices.

13 . The system of claim 12 , wherein the second data store is configured to map the first device extensions to respective external contact numbers.

14 . A non-transitory computer-readable medium comprising instructions that when executed by a processor, cause the processor to perform operations comprising:

dynamically determining, at call setup, a routing path for a call based on a real-time synchronized unified directory that maps extensions and numbers across native devices and non-native devices, wherein the unified directory is updated in real-time as unified directory mappings change;

routing the call from a first device associated with a first carrier of a network through a private branch exchange (PBX) via an internet gateway configured to communicate directly with the first device;

routing the call from a session border controller (SBC) communicatively coupled to the PBX via a session initiation protocol (SIP) trunk based on the determined routing, wherein the SBC is an intermediary that dynamically routes calls between the native devices and the non-native devices based on the unified directory; and

routing the call to a second device associated with a second carrier of the network via a call manager associated with the second carrier.

15 . The non-transitory computer-readable medium of claim 14 , wherein the PBX is associated with a native network.

16 . The non-transitory computer-readable medium of claim 14 , wherein the PBX is a cloud-based PBX.

17 . The non-transitory computer-readable medium of claim 14 , wherein the operations further comprise:

routing the call to an independent carrier (IC) public switched telephone network (PSTN) when the call is destined for an external device that is not associated with the network.

18 . The non-transitory computer-readable medium of claim 14 , wherein the operations further comprise:

routing the call to the call manager of the network when the call is destined for a native device associated with the network.

19 . The non-transitory computer-readable medium of claim 14 , wherein the first device is a voice-over-internet protocol (VoIP) device.

20 . The non-transitory computer-readable medium of claim 14 , wherein the first device has a non-native carrier number.