You should have Hardware videoconferencing bridges to do ad hoc video conference on CUCM ver. 7.1.5.Hardware videoconferencing bridges have hardware DSPs that are used for the video conferences. The Cisco 3500 Series Multipoint Control Units (MCUs) are this type of videoconferencing bridge. Most hardware videoconferencing bridges can also be used as audio-only conference bridges. Hardware videoconferencing bridges provide the following advantages.
other way is to upgrade the call manager to 8.6 and get some pvdm3 on router but for that u need 2900 series router.
on these u can create video conference media resource
thanks
Vipul Jindal
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