What are the disadvantages of video calling

Disadvantages:
Months may be required to enable video conferencing capability within a large organization; this is including time required for designing the network and installing video conferencing equipment. Initial cost of equipment is higher than if an outside service organization were used.
Using conference rooms for video conferences makes sense from a facilities perspective but this can cause video systems to be under utilized. Normally, in an organization, most meetings and conference room use are for local business without a need to communicate with other facilities or locations. Therefore, video equipment investment can be stranded during every day normal use of conference rooms for local meetings.
Many organizations assign a central staff to run a video conference network without considering the needs of each remote site. Video conferencing requires at least two locations, each with its own system, network, conference or meeting room and operating instructions. Each location, therefore, normally should have a skilled operator of video systems to assist users in getting a conference started and keeping it running. Few organizations are willing to expend the funds to ensure each endpoint is staffed with a skilled technician and so this skill deficit can cause conference failures in some locations, particularly those that turn systems off daily or reboot frequently.
Industry manufacturers understand this common problem and are providing software tools and remote management capability with the latest video conference equipment to allow for remote management of systems. Therefore, a well-run network requires either skilled personnel at each endpoint or some form of remote management in order to ensure systems operate well. Some combination of both is usually required to attain high levels of video network up time.