Border Element (Unified Border Element) is the Cisco session border controller
(SBC) gateway that facilitates connectivity between independent VoIP networks
by enabling SIP, H.323, VoIP, and video conference calls from one IP network to
integrates with Unified Border Element to enable recording without regard to
the endpoint type. Because of this capability, MediaSense can use Unified
Border Element to record inbound and outbound media.
Unified Border Element documentation for
more information about Unified Border Element.
figure illustrates a MediaSense deployment with Unified Border Element. Even in
a Unified Border Element deployment, MediaSense depends on Unified
Communications Manager to provide authentication services.
Figure 1. MediaSense
Deployment with Unified Border Element
In the preceding
illustration, the Real-Time Protocol (RTP) carries voice data between the
endpoints and Unified Border Element. The Session Initiation Protocol (SIP)
carries call signaling information between the endpoints and Unified Border
Element. Two RTP unidirectional streams represent two audio streams forked from
Unified Border Element to MediaSense. Streams from Unified Border Element to
MediaSense are unidirectional because only Unified Border Element sends data to
MediaSense; MediaSense does not send any media to Unified Border Element.
Unified Border Element has three dial-peers: inbound, outbound, and forking.
Dial-Peer Level Setup
for more information.)
Border Element can fork only SIP-to-SIP calls. However, because you can use the
same Cisco router as both a TDM-to-IP gateway and a media-forking device for
call recording, you can also record incoming TDM or analog calls if you have
the required licensing and an appropriate Cisco IOS version. (For more
information, see the
Unified Border Element documentation.)
To use this feature,
you must enable both gateway and border-element functionality in the device.
You can configure the gateway to receive the TDM or analog call and then feed
the call back to itself as a SIP call with a different dialed number. When you
configure this loop, the router actually handles each call twice. (This feature
cuts the router capacity in half and Unified Border Element can process only
half as many calls.) For more information, see the
"Media Forking on a
TDM Gateway" section in the
Cisco MediaSense Developer Guide and the
MediaSense FAQ article at