Call Types
Expressway distinguishes between the following types of call:
-
Registered. That is, room and desktop registrations
-
Rich Media Sessions (RMS)
Registered
Calls between locally registered endpoints (registered to Unified CM or Expressway) do not consume licenses, as that entitlement is included within the registration. The call entitlement within the registration license includes the following scenarios:
-
Calls to other endpoints registered to Unified CM or Expressway within the same network, when the call is routed through a neighbor or traversal zone.
-
Unified CM remote sessions. These are Mobile and Remote Access (MRA) calls – 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.
-
Calls to Cisco conferencing resources (CMR, TelePresence Server/ TelePresence Conductor, or Acano servers).
Note |
|
RMS
These calls consume RMS licenses and consist of every other type of video or audio call that is routed through the Expressway. RMS licenses are consumed on the exit node of the Expressway in the following scenarios:
-
B2B
-
Jabber Guest
-
Interworked or gatewayed calls to third-party solutions (If the third-party endpoint is not registered to Cisco infrastructure)
Expressway may take the media or just the signaling.
Audio-only SIP calls are treated distinctly from video SIP calls. Each RMS license allows either 1 video call or 2 audio only SIP calls. So for example, a 100 RMS license would allow 90 video and 20 SIP audio-only simultaneous calls. Any other type of audio-only call uses an RMS license.
Note |
|
Limitation
Resource Usage Call Counters Increment Incorrectly for "audio-only" Calls
Condition: Expressway should ideally keep the video counters at zero if a video call is never made.
Explanation: The call counters in the Expressway Web User Interface under "audio-only" call counter increments. It is observed on early-offer calls as well when the Expressway never sees video capabilities.
page can increment non-intuitively under certain scenarios. Before a call connects, the counters are incremented as video calls. After the call connects, if no video is negotiated, the video counter decrements, andThe following behaviors are observed:
-
If an endpoint makes an "audio-only" call through an Expressway and the far-end does not answer, the call is counted as a "Current video" call while it is ringing. Subsequently, the call is counted towards the "Peak video" calls as well.
-
If multiple "audio-only" calls occur simultaneously: For example, 4 endpoints joining a meeting at once, the "Current video" counter increments 4 times before the calls connect. The "Peak video" counter will permanently increase to 4 . After the calls connect, the "Current video" counter is decremented to 0 and the audio call counters are incremented correctly.
These counters increasing can lead to confusion about video calls unexpectedly traversing an Expressway pair that is only supposed to handle audio calls. The Expressway should ideally keep the video counters at zero if a video call is never made.