Video intercom communication for VOIP device

A system, comprising:

• a session border controller (SBC) configured to:
• receive a first session initiation protocol (SIP) invite message from an intercom device to establish an audio call with a voice over internet protocol (VOIP) device;
• transmit, to the VOIP device, a second SIP invite message that indicates the first SIP invite message from the intercom device;
• determine whether each of the intercom device and the VOIP device have video capability, wherein the SBC is configured to:
• obtain a video intercom device capability field from the first SIP invite message and a VOIP device capability field from an accept message received from the VOIP device, and
• determine based on the video intercom device capability field and the VOIP device capability field whether the intercom device and the VOIP device each have video capability;
• elevate the audio call to a video call based on a determination that both the intercom device and the VOIP device have video capability, wherein elevation of the audio call to the video call bypasses a background server and routes video data directly to an SBC of a cloud private branch exchange (PBX) system;
• transmit a third SIP invite message that indicates elevation of the audio call to the video call;
• and
• forward video data received from the intercom device to the VOIP device, wherein the video data is sent via the SBC using a secure real-time protocol (SRTP).

A non-transitory computer-readable medium comprising instructions that when executed by one or more processors, causes the one or more processors to perform operations comprising:

• receiving a first session initiation protocol (SIP) invite message from an intercom device to establish an audio call with a voice over internet protocol (VOIP) device;
• transmitting, to the VOIP device, a second SIP invite message that indicates the first SIP invite message from the intercom device;
• determining whether each of the intercom device and the VOIP device have video capability, wherein determining whether each of the intercom device and the VOIP device have video capability comprises:
• obtaining a video intercom device capability field from the first SIP invite message and a VOIP device capability field from an accept message received from the VOIP device, and
• determining based on the video intercom device capability field and the VOIP device capability field, whether the intercom device and the VOIP device each have video capability;
• elevating the audio call to a video call based on a determination that both the intercom device and the VOIP device have video capability, wherein elevating the audio call to the video call includes bypassing a backend server and routing video data directly to a session border controller (SBC) of a cloud private branch exchange (PBX) system;
• transmitting a third SIP invite message that indicates elevation of the audio call to the video call;
• and
• forwarding video data received from the intercom device to the VOIP device, wherein the video data is sent via the SBC using a secure real-time protocol (SRTP).