Cisco Cisco TelePresence Video Communication Server Expressway 관리 매뉴얼
Call Types and Licensing
This section describes the different call types recognized by the VCS and how they are licensed.
Call Types
The VCS distinguishes between the following types of call:
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Unified CM remote sessions: these are "mobile and remote access" calls i.e.video or audio calls from
devices located outside the enterprise that are routed via the Expressway firewall traversal solution to
endpoints registered to Unified CM. These calls do not require any type of call license, although they do
contribute to traversal load.
devices located outside the enterprise that are routed via the Expressway firewall traversal solution to
endpoints registered to Unified CM. These calls do not require any type of call license, although they do
contribute to traversal load.
■
VCS traversal calls: these are standard VCS video or audio calls, including business-to-business calls,
B2BUA calls (for media encryption or ICE), and interworked or gatewayed calls to third-party solutions where
the VCS takes both the call signaling and the call media. Each call consumes a traversal call license.
B2BUA calls (for media encryption or ICE), and interworked or gatewayed calls to third-party solutions where
the VCS takes both the call signaling and the call media. Each call consumes a traversal call license.
Audio-only SIP traversal calls are treated distinctly from video SIP traversal calls. Each traversal call license
allows either 1 video call or 2 audio-only SIP calls. Hence, a 100 traversal call license would allow, for
example, 90 video and 20 SIP audio-only simultaneous calls. Any other audio-only call (non-traversal, H.323
or interworked) will consume a standard video call license (traversal or non-traversal as appropriate).
allows either 1 video call or 2 audio-only SIP calls. Hence, a 100 traversal call license would allow, for
example, 90 video and 20 SIP audio-only simultaneous calls. Any other audio-only call (non-traversal, H.323
or interworked) will consume a standard video call license (traversal or non-traversal as appropriate).
■
VCS non-traversal calls: these are standard VCS video or audio calls where the signaling passes through the
VCS but the media goes directly between the endpoints, or between an endpoint and another system in the
call route. Each call consumes a non-traversal call license. Note that Lync B2BUA calls are classified as non-
traversal calls (even though the media does traverse the VCS).
VCS but the media goes directly between the endpoints, or between an endpoint and another system in the
call route. Each call consumes a non-traversal call license. Note that Lync B2BUA calls are classified as non-
traversal calls (even though the media does traverse the VCS).
Each VCS also allows up to 750 concurrent non-traversal calls.
Note that:
■
VCS defines an "audio-only" SIP call as one that was negotiated with a single “m=” line in the SDP. Thus, for
example, if a person makes a “telephone” call but the SIP UA includes an additional m= line in the SDP, the
call will consume a video call license.
example, if a person makes a “telephone” call but the SIP UA includes an additional m= line in the SDP, the
call will consume a video call license.
■
While an "audio-only" SIP call is being established, it is treated (licensed) as a video call. It only becomes
licensed as "audio-only" when the call setup has completed. This means that if your system approaches its
maximum licensed limit, you may be unable to connect some "audio-only" calls if they are made
simultaneously.
licensed as "audio-only" when the call setup has completed. This means that if your system approaches its
maximum licensed limit, you may be unable to connect some "audio-only" calls if they are made
simultaneously.
■
The VCS does not support midcall license optimization.
License Bypass for Calls to Collaboration Meeting Rooms (CMRs)
The VCS no longer requires traversal call licenses for calls to and from cloud-based CMRs. This includes SIP calls
between Collaboration Cloud and the CMR Hybrid solution.
between Collaboration Cloud and the CMR Hybrid solution.
Note:
This only applies when the dialed string does not need transformation on the VCS (for example,
user@sitename.webex.com).
Although untransformed SIP calls to cloud-based CMRs do not consume licenses, they do consume resources and
may not progress if the VCS is at full capacity.
may not progress if the VCS is at full capacity.
There is no license bypass for CMR Premises calls. H.323 calls to cloud-based CMRs still consume licenses.
What are Traversal Calls?
A traversal call is any call passing through the VCS that includes both the signaling (information about the call) and
media (voice and video). The only other type of call is a non-traversal call, where the signaling passes through the
VCS but the media goes directly between the endpoints (or between one endpoint and another VCS in the call route,
or between two VCSs in the call route).
media (voice and video). The only other type of call is a non-traversal call, where the signaling passes through the
VCS but the media goes directly between the endpoints (or between one endpoint and another VCS in the call route,
or between two VCSs in the call route).
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Cisco TelePresence Video Communication Server Administrator Guide